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/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