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/fresh.md

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+---
+name: fresh
+category: natural
+---
+
+# Fresh Style
+
+Clean, refreshing, natural aesthetic.
+
+## Element Combination
+
+```yaml
+canvas:
+  ratio: portrait-3-4
+  grid: single | triptych
+
+image_effects:
+  cutout: soft
+  stroke: white-solid | none
+  filter: clear-glow | cool-tone
+
+typography:
+  decorated: none | highlight
+  tags: pill | white-black
+  direction: horizontal
+
+decorations:
+  emphasis: checkmark | circle-mark
+  background: solid-white | solid-pastel
+  doodles: leaves | clouds | bubbles
+  frames: rounded-rect | none
+```
+
+## Color Palette
+
+| Role | Colors | Hex |
+|------|--------|-----|
+| Primary | Mint green, sky blue, light yellow | #9AE6B4, #90CDF4, #FAF089 |
+| Background | Pure white, soft mint | #FFFFFF, #F0FFF4 |
+| Accents | Leaf green, water blue | #48BB78, #4299E1 |
+
+## Visual Elements
+
+- Plant leaves, clouds, water drops
+- Simple geometric shapes
+- Breathing room, open composition
+- Natural, organic elements
+
+## Typography
+
+- Clean, light hand lettering with breathing room
+- Airy spacing
+- Fresh color accents
+
+## Best Layout Pairings
+
+| Layout | Compatibility | Use Case |
+|--------|---------------|----------|
+| sparse | ✓✓ | Clean covers |
+| balanced | ✓✓ | Standard fresh content |
+| dense | ✓ | Organized information |
+| list | ✓ | Wellness tips |
+| comparison | ✓ | Before/after health |
+| flow | ✓✓ | Organic processes |
+
+## Best For
+
+- Health and wellness
+- Minimalist lifestyle
+- Self-care content
+- Nature-related topics
+- Clean living tips