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/presets/retro.md

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+---
+name: retro
+category: vintage
+---
+
+# Retro Style
+
+Vintage, nostalgic, trendy aesthetic.
+
+## Element Combination
+
+```yaml
+canvas:
+  ratio: portrait-3-4
+  grid: single | dual
+
+image_effects:
+  cutout: stylized
+  stroke: dashed | double
+  filter: film-grain | muted-tones
+
+typography:
+  decorated: brush | handwritten
+  tags: stamp | ribbon
+  direction: horizontal
+
+decorations:
+  emphasis: star-burst | numbering
+  background: paper-texture | dots
+  doodles: stars-sparkles | squiggles
+  frames: polaroid | film-strip | stamp-border
+```
+
+## Color Palette
+
+| Role | Colors | Hex |
+|------|--------|-----|
+| Primary | Muted orange, dusty pink, faded teal | #E07A4D, #D4A5A5, #6B9999 |
+| Background | Aged paper, sepia tones | #F5E6D3, #E8DCC8 |
+| Accents | Faded red, vintage gold | #C55A5A, #B8860B |
+
+## Visual Elements
+
+- Halftone dots, vintage badges
+- Classic icons, tape effects
+- Aged texture overlays
+- Nostalgic decorative elements
+
+## Typography
+
+- Vintage-style hand lettering
+- Classic feel with imperfections
+- Aged texture on text
+
+## Best Layout Pairings
+
+| Layout | Compatibility | Use Case |
+|--------|---------------|----------|
+| sparse | ✓✓ | Vintage covers |
+| balanced | ✓✓ | Classic content |
+| dense | ✓ | Vintage knowledge cards |
+| list | ✓✓ | Classic rankings |
+| comparison | ✓ | Then vs now |
+| flow | ✓ | Historical timelines |
+
+## Best For
+
+- Throwback content
+- Classic tips
+- Timeless advice
+- Vintage aesthetics
+- Nostalgic shares