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/midnight-galaxy.md

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+# Midnight Galaxy
+
+A dramatic and cosmic theme with deep purples and mystical tones for impactful presentations.
+
+## Color Palette
+
+- **Deep Purple**: `#2b1e3e` - Rich dark base
+- **Cosmic Blue**: `#4a4e8f` - Mystical mid-tone
+- **Lavender**: `#a490c2` - Soft accent color
+- **Silver**: `#e6e6fa` - Light highlights and text
+
+## Typography
+
+- **Headers**: FreeSans Bold
+- **Body Text**: FreeSans
+
+## Best Used For
+
+Entertainment industry, gaming presentations, nightlife venues, luxury brands, creative agencies.