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/sunset-boulevard.md

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+# Sunset Boulevard
+
+A warm and vibrant theme inspired by golden hour sunsets, perfect for energetic and creative presentations.
+
+## Color Palette
+
+- **Burnt Orange**: `#e76f51` - Primary accent color
+- **Coral**: `#f4a261` - Secondary warm accent
+- **Warm Sand**: `#e9c46a` - Highlighting and backgrounds
+- **Deep Purple**: `#264653` - Dark contrast and text
+
+## Typography
+
+- **Headers**: DejaVu Serif Bold
+- **Body Text**: DejaVu Sans
+
+## Best Used For
+
+Creative pitches, marketing presentations, lifestyle brands, event promotions, inspirational content.