feat(baoyu-image-cards): add image card series skill migrated from baoyu-xhs-images

Rename baoyu-xhs-images to baoyu-image-cards to decouple from Xiaohongshu platform.
Deprecate baoyu-xhs-images with migration notice pointing to baoyu-image-cards.

skills/baoyu-image-cards/references/elements/canvas.md

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+# Canvas & Layout
+
+Core canvas specifications and layout grids for Xiaohongshu infographics.
+
+## Aspect Ratios
+
+| Name | Ratio | Pixels | Note |
+|------|-------|--------|------|
+| portrait-3-4 | 3:4 | 1242×1660 | Highest traffic on XHS (recommended) |
+| square | 1:1 | 1242×1242 | Second recommended |
+| portrait-2-3 | 2:3 | 1242×1863 | Taller format |
+
+**Default**: portrait-3-4 for maximum engagement.
+
+## Safe Zones
+
+Avoid placing critical content in these areas:
+
+| Zone | Position | Reason |
+|------|----------|--------|
+| bottom-overlay | Bottom 10% | Title bar overlay on mobile |
+| top-right | Top-right corner | Like/share button overlay |
+| bottom-right | Bottom-right corner | Watermark position |
+
+```
+┌─────────────────────────────┐
+│                 [like/share]│  ← top-right: avoid
+│                             │
+│                             │
+│      ✓ SAFE CONTENT AREA    │
+│                             │
+│                             │
+│  [title bar overlay area]   │  ← bottom 10%: avoid key info
+└─────────────────────────────┘
+```
+
+## Grid Layouts
+
+### Density-Based Layouts
+
+| Layout | Info Density | Whitespace | Points/Image | Best For |
+|--------|--------------|------------|--------------|----------|
+| sparse | Low | 60-70% | 1-2 | Covers, quotes, impactful statements |
+| balanced | Medium | 40-50% | 3-4 | Standard content, tutorials |
+| dense | High | 20-30% | 5-8 | Knowledge cards, cheat sheets |
+
+### Structure-Based Layouts
+
+| Layout | Structure | Items | Best For |
+|--------|-----------|-------|----------|
+| list | Vertical enumeration | 4-7 | Rankings, checklists, step guides |
+| comparison | Left vs Right | 2 sections | Before/after, pros/cons |
+| flow | Connected nodes | 3-6 steps | Processes, timelines, workflows |
+| mindmap | Center radial | 4-8 branches | Concept maps, brainstorming, topic overview |
+| quadrant | 4-section grid | 4 sections | SWOT analysis, priority matrix, classification |
+
+## Layout by Position
+
+| Position | Recommended Layout | Why |
+|----------|-------------------|-----|
+| Cover | sparse | Maximum visual impact, clear title |
+| Setup | balanced | Context without overwhelming |
+| Core | balanced/dense/list | Based on content density |
+| Payoff | balanced/list | Clear takeaways |
+| Ending | sparse | Clean CTA, memorable close |
+
+## Grid Cells
+
+For multi-element compositions:
+
+| Name | Cells | Use Case |
+|------|-------|----------|
+| single | 1 | Hero image, maximum impact |
+| dual | 2 | Before/after, comparison |
+| triptych | 3 | Steps, process flow |
+| quad | 4 | Product showcase |
+| six-grid | 6 | Checklist, collection |
+| nine-grid | 9 | Multi-image gallery |
+
+## Visual Balance
+
+### Sparse Layout
+- Single focal point centered
+- Breathing room on all sides
+- Symmetrical composition
+
+### Balanced Layout
+- Top-weighted title
+- Evenly distributed content below
+- Clear visual hierarchy
+
+### Dense Layout
+- Organized grid structure
+- Clear section boundaries
+- Compact but readable spacing
+
+### List Layout
+- Left-aligned items
+- Clear number/bullet hierarchy
+- Consistent item format
+
+### Comparison Layout
+- Symmetrical left/right
+- Clear visual contrast
+- Divider between sections
+
+### Flow Layout
+- Directional flow (top→bottom or left→right)
+- Connected nodes with arrows
+- Clear progression indicators
+
+### Mindmap Layout
+- Central topic node
+- Radial branches outward
+- Hierarchical sub-branches
+- Organic curved connections
+
+### Quadrant Layout
+- 4-section grid (2×2)
+- Clear axis labels
+- Each quadrant with distinct content
+- Optional circular variant for cycles

skills/baoyu-image-cards/references/elements/decorations.md

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+# Decorative Assets
+
+Visual embellishments and decorative elements for Xiaohongshu infographics.
+
+## Emphasis Marks (强调标记)
+
+Elements to draw attention to specific content.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| red-arrow | Red arrow pointing to target | Product features, key points |
+| circle-mark | Circle highlight annotation | Highlighting details |
+| underline | Straight or wavy underline | Text emphasis |
+| star-burst | Starburst explosion effect | Special offers, wow factor |
+| checkmark | Checkmark/tick symbol | Completed items, pros |
+| cross-mark | X mark symbol | Cons, things to avoid |
+| exclamation | Exclamation point decoration | Important warnings |
+| question | Question mark decoration | FAQ, curiosity |
+| numbering | Circled numbers | Steps, rankings |
+| bracket | Bracket highlighting | Grouping, emphasis |
+
+## Backgrounds (背景)
+
+Base layer treatments.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| solid-saturated | High-saturation solid color | Bold, energetic |
+| solid-pastel | Soft pastel solid color | Cute, gentle |
+| gradient-linear | Linear color gradient | Modern, dynamic |
+| gradient-radial | Radial color gradient | Spotlight effect |
+| frosted-glass | Frosted glass blur effect | Layered compositions |
+| paper-texture | Paper or craft texture | Handmade aesthetic |
+| fabric-texture | Fabric/cloth texture | Cozy, tactile |
+| chalkboard | Blackboard texture | Educational content |
+| grid | Subtle grid pattern | Structured, organized |
+| dots | Polka dot pattern | Playful, retro |
+
+## Doodles & Emoji (涂鸦)
+
+Hand-drawn decorative elements.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| hand-drawn-lines | Sketchy hand-drawn lines | Connections, borders |
+| stars-sparkles | Stars and sparkle effects | Magic, excellence |
+| flowers | Floral decorations | Beauty, feminine |
+| hearts | Heart symbols | Love, favorites |
+| clouds | Cloud shapes | Dreamy, thoughts |
+| arrows-curvy | Curved directional arrows | Flow, direction |
+| squiggles | Wavy squiggle lines | Energy, movement |
+| confetti | Scattered confetti | Celebration |
+| leaves | Leaf decorations | Nature, fresh |
+| bubbles | Circular bubble shapes | Playful, light |
+
+## Emoji Integration
+
+| Category | Examples | Use Case |
+|----------|----------|----------|
+| Reactions | 🥹 😍 🤯 | Emotional emphasis |
+| Objects | ✨ 💡 🎯 | Visual markers |
+| Actions | 👇 👆 ➡️ | Directional cues |
+| Nature | 🌸 🌿 ☀️ | Thematic decoration |
+
+## Frames (边框)
+
+Container and border treatments.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| polaroid | Instant photo frame | Photo showcase |
+| film-strip | Film negative border | Cinematic, retro |
+| phone-screenshot | Mobile device mockup | App/screen content |
+| torn-paper | Torn paper edge effect | Scrapbook aesthetic |
+| rounded-rect | Rounded rectangle border | Clean containers |
+| decorative | Ornate decorative border | Premium, elegant |
+| tape-corners | Washi tape corners | Crafty, casual |
+| stamp-border | Stamp perforated edge | Vintage, postal |
+
+## Dividers (分隔线)
+
+Section separators.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| line-simple | Simple horizontal line | Clean separation |
+| line-dashed | Dashed line | Subtle division |
+| line-wavy | Wavy line | Playful separation |
+| dots-row | Row of dots | Decorative division |
+| ornamental | Decorative flourish | Elegant separation |
+
+## Stickers (贴纸)
+
+Pre-composed decorative elements.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| badge-new | "NEW" badge | New products |
+| badge-hot | "HOT" badge | Trending items |
+| badge-sale | Sale/discount badge | Promotions |
+| seal-quality | Quality seal | Recommendations |
+| ribbon-award | Award ribbon | Best picks |
+| tag-price | Price tag shape | Pricing info |
+
+## Style-Specific Decorations
+
+### Cute Style
+- Hearts, stars, sparkles
+- Ribbon decorations, sticker-style
+- Cute character elements
+
+### Notion Style
+- Simple line doodles
+- Geometric shapes, stick figures
+- Maximum whitespace, minimal decoration
+
+### Warm Style
+- Sun rays, coffee cups, cozy items
+- Warm lighting effects
+- Friendly, inviting decorations
+
+### Fresh Style
+- Plant leaves, clouds, water drops
+- Simple geometric shapes
+- Open, breathing composition
+
+### Bold Style
+- Exclamation marks, arrows
+- Warning icons, strong shapes
+- High contrast elements
+
+### Pop Style
+- Bold shapes, speech bubbles
+- Comic-style effects, starburst
+- Dynamic, energetic decorations
+
+### Retro Style
+- Halftone dots, vintage badges
+- Classic icons, tape effects
+- Aged texture overlays
+
+### Chalkboard Style
+- Chalk dust effects
+- Hand-drawn doodles
+- Mathematical formulas, simple icons
+
+### Screen-Print Style
+- Bold silhouettes, geometric shapes
+- Halftone dot patterns, print grain
+- No doodles — negative space does the work
+- Stencil-cut edges, color block boundaries
+- Vintage poster border treatments

skills/baoyu-image-cards/references/elements/image-effects.md

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+# Image Processing Layer
+
+Visual effects applied to image elements in Xiaohongshu infographics.
+
+## AI Cutout (抠图)
+
+Subject extraction styles for product/figure isolation.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| clean | Sharp edges, precise boundaries | Product photography, tech items |
+| soft | Soft transition, feathered edges | Portrait cutout, organic subjects |
+| stylized | Hand-drawn edge treatment | Artistic compositions |
+
+## Stroke Effects (描边)
+
+Border treatments for cutout elements.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| white-solid | White solid line border | Classic sticker feel, high contrast |
+| colored-solid | Colored solid line border | Playful vibe, brand colors |
+| dashed | Dashed/dotted border | Handmade aesthetic, casual |
+| double | Double-layer stroke | Emphasis effect, premium feel |
+| glow | Soft outer glow | Dreamy, soft aesthetic |
+| shadow | Drop shadow effect | Depth, floating element |
+
+**Stroke Width Guidelines**:
+- Thin: 2-4px - Subtle, elegant
+- Medium: 5-8px - Standard visibility
+- Thick: 10-15px - Bold emphasis
+
+## Filters (滤镜)
+
+Color grading and mood presets popular on XHS.
+
+| Name | Chinese | Description | Mood |
+|------|---------|-------------|------|
+| clear-glow | 清透感 | Transparent, radiant, luminous | Fresh, youthful |
+| film-grain | 胶片感 | Vintage film aesthetic, grain texture | Nostalgic, artistic |
+| cream-skin | 奶油肌 | Smooth, creamy complexion tones | Soft, flattering |
+| japanese-magazine | 日杂感 | Lifestyle magazine aesthetic | Curated, aspirational |
+| high-saturation | 高饱和 | Vibrant, punchy colors | Energetic, eye-catching |
+| muted-tones | 莫兰迪 | Morandi-style desaturated palette | Sophisticated, calm |
+| warm-tone | 暖色调 | Golden hour warmth | Cozy, inviting |
+| cool-tone | 冷色调 | Blue-shifted coolness | Modern, clean |
+
+## Texture Overlays
+
+Additional texture effects.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| paper | Paper or fabric texture | Handmade feel |
+| noise | Fine grain noise | Analog aesthetic |
+| halftone | Dot pattern | Retro print style |
+| scratch | Light scratch marks | Vintage wear |
+
+## Blending Modes
+
+For layered compositions.
+
+| Mode | Effect | Use Case |
+|------|--------|----------|
+| multiply | Darken, merge | Shadow effects |
+| screen | Lighten, glow | Light effects |
+| overlay | Contrast boost | Vibrant compositions |
+| soft-light | Subtle blending | Natural layering |
+
+## Effect Combinations
+
+Common effect stacks for different styles:
+
+### Cute Style
+- Filter: clear-glow or cream-skin
+- Stroke: white-solid (medium)
+- Texture: none
+
+### Notion Style
+- Filter: none or muted-tones
+- Stroke: white-solid (thin) or none
+- Texture: paper (subtle)
+
+### Retro Style
+- Filter: film-grain
+- Stroke: double or dashed
+- Texture: halftone, scratch
+
+### Bold Style
+- Filter: high-saturation
+- Stroke: colored-solid (thick)
+- Texture: none

skills/baoyu-image-cards/references/elements/typography.md

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+# Typography System
+
+Text styling elements for Xiaohongshu infographics.
+
+## Decorated Text (花字)
+
+Stylized text treatments for emphasis and visual appeal.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| gradient | Gradient color fill | Title emphasis, modern feel |
+| stroke-text | Outlined text with stroke | Cover headlines, high visibility |
+| shadow-3d | 3D shadow/extrusion effect | Key terms, depth |
+| highlight | Highlighter marker effect | Critical information, key points |
+| neon | Neon glow effect | Tech content, night aesthetic |
+| handwritten | Authentic handwritten style | Personal touch, casual |
+| bubble | Rounded, inflated letterforms | Cute, playful content |
+| brush | Brush stroke texture | Artistic, dynamic |
+
+## Tags & Labels (标签)
+
+Structured text containers.
+
+| Name | Description | Use Case |
+|------|-------------|----------|
+| black-white | Black background, white text | Brand names, prices, categories |
+| white-black | White background, black text | Clean labels, minimal style |
+| bubble | Speech bubble style | Dialogue, annotations, callouts |
+| pointer | Arrow pointer with label | Product callouts, pointing to features |
+| ribbon | Ribbon/banner shape | Special offers, highlights |
+| stamp | Stamp/seal style | Authenticity, recommendations |
+| pill | Rounded pill shape | Tags, categories, keywords |
+
+## Text Hierarchy
+
+Recommended text sizing for visual hierarchy.
+
+| Level | Role | Relative Size | Style |
+|-------|------|---------------|-------|
+| H1 | Main title | 100% | Bold, decorated |
+| H2 | Section header | 70-80% | Semi-bold |
+| H3 | Subsection | 50-60% | Medium weight |
+| Body | Content text | 40-50% | Regular |
+| Caption | Small notes | 30-35% | Light |
+
+## Text Direction
+
+| Direction | Description | Use Case |
+|-----------|-------------|----------|
+| horizontal | Standard left-to-right | Default for most content |
+| vertical | Top-to-bottom columns | Magazine style, traditional Chinese |
+| curved | Text following a curve | Decorative, around shapes |
+| diagonal | Angled text | Dynamic compositions |
+
+## Text Effects
+
+| Effect | Description | Use Case |
+|--------|-------------|----------|
+| shadow | Drop shadow behind text | Readability on busy backgrounds |
+| outline | Outline around letterforms | High contrast visibility |
+| glow | Soft glow around text | Dreamy, emphasis |
+| underline-wavy | Wavy underline decoration | Playful emphasis |
+| strikethrough | Crossed out text | Before/after, corrections |
+
+## Language Considerations
+
+### Chinese Text (中文)
+- Punctuation: 「」（）、。！？
+- Spacing: No spaces between characters
+- Line height: 1.5-1.8x for readability
+
+### Mixed Text
+- English in Chinese context: Maintain consistent baseline
+- Numbers: Use consistent number style (lining vs old-style)
+
+## Style-Specific Typography
+
+### Cute Style
+- Rounded, bubbly hand lettering
+- Soft shadows, playful decorations
+- Pink/pastel color accents
+
+### Notion Style
+- Clean hand-drawn lettering
+- Simple sans-serif labels
+- Minimal decoration
+
+### Bold Style
+- Impactful hand lettering with shadows
+- High contrast colors
+- Strong outlines
+
+### Chalkboard Style
+- Chalk texture on all text
+- Visible imperfections
+- Multi-color chalk variety