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/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