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/notion.md

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+---
+name: notion
+category: minimal
+---
+
+# Notion Style
+
+Minimalist hand-drawn line art, intellectual aesthetic.
+
+## Element Combination
+
+```yaml
+canvas:
+  ratio: portrait-3-4
+  grid: single | dual
+
+image_effects:
+  cutout: clean
+  stroke: none | white-solid
+  filter: none | muted-tones
+
+typography:
+  decorated: none | handwritten
+  tags: black-white | pill
+  direction: horizontal
+
+decorations:
+  emphasis: circle-mark | underline
+  background: solid-white | paper-texture
+  doodles: hand-drawn-lines | arrows-curvy
+  frames: none | rounded-rect
+```
+
+## Color Palette
+
+| Role | Colors | Hex |
+|------|--------|-----|
+| Primary | Black, dark gray | #1A1A1A, #4A4A4A |
+| Background | Pure white, off-white | #FFFFFF, #FAFAFA |
+| Accents | Pastel blue, pastel yellow, pastel pink | #A8D4F0, #F9E79F, #FADBD8 |
+
+## Visual Elements
+
+- Simple line doodles, hand-drawn wobble effect
+- Geometric shapes, stick figures
+- Maximum whitespace, single-weight ink lines
+- Clean, uncluttered compositions
+
+## Typography
+
+- Clean hand-drawn lettering
+- Simple sans-serif labels
+- Minimal decoration on text
+
+## Best Layout Pairings
+
+| Layout | Compatibility | Use Case |
+|--------|---------------|----------|
+| sparse | ✓✓ | Concept covers |
+| balanced | ✓✓ | Standard explanations |
+| dense | ✓✓ | Knowledge cards, cheat sheets |
+| list | ✓✓ | Productivity tips, tool lists |
+| comparison | ✓✓ | Data comparisons |
+| flow | ✓✓ | Process diagrams |
+
+## Best For
+
+- Knowledge sharing
+- Concept explanations
+- SaaS content
+- Productivity tips
+- Tech tutorials
+- Professional content