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

AGENTS.md

@@ -143,7 +143,7 @@ description: Brief description. Use when user wants to [action].
 - Check `Content-Type` header — binary image OR JSON with base64
 
 ### Credential Safety
-- Chutes API: `CHUTES_API_TOKEN` environment variable
+- MiniMax API: `MINIMAX_API_KEY` environment variable
 - Gitea: `GITEA_API_TOKEN`, `GITEA_USERNAME`, `GITEA_URL`
 - Easypanel: `EASYPANEL_USERNAME`, `EASYPANEL_PASSWORD` (auto-generates session token)
 - All loaded from `.env` (gitignored)
@@ -219,11 +219,11 @@ python3 skills/website-creator/scripts/migrate_existing_website.py \
 ### Binary Response Handling
 - Check `Content-Type` header - API may return raw binary OR JSON with base64
 
-### Chutes API
-- All image skills use `CHUTES_API_TOKEN` environment variable
+### MiniMax API
+- TTS, Music, Video, Image generation use `MINIMAX_API_KEY` environment variable
 
 ### Skill Categories
-- **Full implementation:** gitea-sync, easypanel-deploy, website-creator, image-*
+- **Full implementation:** gitea-sync, easypanel-deploy, thai-frontend-dev, minimax-*
 - **Docs-only:** None (all skills now have scripts)
 
 ## COMMANDS