feat: Import 35+ skills, merge duplicates, add openclaw installer

Major updates:
- Added 35+ new skills from awesome-opencode-skills and antigravity repos
- Merged SEO skills into seo-master
- Merged architecture skills into architecture
- Merged security skills into security-auditor and security-coder
- Merged testing skills into testing-master and testing-patterns
- Merged pentesting skills into pentesting
- Renamed website-creator to thai-frontend-dev
- Replaced skill-creator with github version
- Removed Chutes references (use MiniMax API instead)
- Added install-openclaw-skills.sh for cross-platform installation
- Updated .env.example with MiniMax API credentials

skills/theme-factory/themes/botanical-garden.md

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+# Botanical Garden
+
+A fresh and organic theme featuring vibrant garden-inspired colors for lively presentations.
+
+## Color Palette
+
+- **Fern Green**: `#4a7c59` - Rich natural green
+- **Marigold**: `#f9a620` - Bright floral accent
+- **Terracotta**: `#b7472a` - Earthy warm tone
+- **Cream**: `#f5f3ed` - Soft neutral backgrounds
+
+## Typography
+
+- **Headers**: DejaVu Serif Bold
+- **Body Text**: DejaVu Sans
+
+## Best Used For
+
+Garden centers, food presentations, farm-to-table content, botanical brands, natural products.