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/minimal.md

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+---
+name: minimal
+category: elegant
+---
+
+# Minimal Style
+
+Ultra-clean, sophisticated aesthetic.
+
+## Element Combination
+
+```yaml
+canvas:
+  ratio: portrait-3-4
+  grid: single
+
+image_effects:
+  cutout: clean
+  stroke: none | white-solid
+  filter: none | muted-tones
+
+typography:
+  decorated: none
+  tags: white-black | pill
+  direction: horizontal
+
+decorations:
+  emphasis: underline | circle-mark
+  background: solid-white | solid-pastel
+  doodles: hand-drawn-lines
+  frames: none | rounded-rect
+```
+
+## Color Palette
+
+| Role | Colors | Hex |
+|------|--------|-----|
+| Primary | Black, white | #000000, #FFFFFF |
+| Background | Off-white, pure white | #FAFAFA, #FFFFFF |
+| Accents | Single color (content-derived) | Blue, green, or coral |
+
+## Visual Elements
+
+- Single focal point, thin lines
+- Maximum whitespace
+- Simple, clean decorations
+- Restrained visual elements
+
+## Typography
+
+- Clean, simple hand lettering
+- Minimal weight variations
+- Elegant spacing
+
+## Best Layout Pairings
+
+| Layout | Compatibility | Use Case |
+|--------|---------------|----------|
+| sparse | ✓✓ | Elegant statements |
+| balanced | ✓✓ | Professional content |
+| dense | ✓✓ | Clean knowledge cards |
+| list | ✓ | Simple lists |
+| comparison | ✓ | Clean comparisons |
+| flow | ✓ | Elegant processes |
+
+## Best For
+
+- Professional content
+- Serious topics
+- Elegant presentations
+- High-end products
+- Business content