feat(baoyu-image-cards): add sketch-notes style, palette system, and 3 new presets

skills/baoyu-image-cards/references/palettes/warm.md

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+# Warm Palette
+
+Warm earth tones on soft peach background. Cozy, inviting, no cool colors.
+
+## Background
+
+- Color: Soft Peach (#FFECD2)
+- Texture: Warm, slightly textured
+
+## Colors
+
+| Role | Color | Hex | Usage |
+|------|-------|-----|-------|
+| Background | Soft Peach | #FFECD2 | Primary background |
+| Text | Deep Brown | #744210 | Titles, main content |
+| Secondary Text | Warm Brown | #9C6644 | Annotations, labels |
+| Zone 1 | Warm Orange | #ED8936 | Information blocks |
+| Zone 2 | Terracotta | #C05621 | Information blocks |
+| Zone 3 | Golden Yellow | #F6AD55 | Information blocks |
+| Zone 4 | Dusty Rose | #D4A09A | Information blocks |
+| Accent | Burnt Sienna | #A0522D | Emphasis, highlights |
+
+## Semantic Constraint
+
+Warm-only color palette, no cool colors (no blue, green, purple). Earth tones throughout. Evokes comfort, warmth, and trust. All colors should feel like autumn sunlight.
+
+## Best Paired With
+
+- `warm` — natural pairing, amplifies cozy feel
+- `cute` — warm pastels enhance the sweet aesthetic
+- `retro` — earth tones complement vintage style
+- `sketch-notes` — warm educational feel