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/frontend-dev/references/env-setup.md

@@ -0,0 +1,33 @@
+# Getting Started
+
+## 1. Set API key
+
+```bash
+export MINIMAX_API_KEY="<paste-your-key-here>"
+```
+
+## 2. Install dependencies
+
+```bash
+pip install requests
+
+# FFmpeg (optional, for audio post-processing)
+# macOS:
+brew install ffmpeg
+# Ubuntu:
+sudo apt install ffmpeg
+```
+
+## 3. Quick test
+
+```bash
+python scripts/minimax_tts.py "Hello world" -o test.mp3
+```
+
+If successful, you'll see `OK: xxxxx bytes -> test.mp3`.
+
+## Next steps
+
+- **Voice selection**: See [minimax-voice-catalog.md](minimax-voice-catalog.md)
+- **TTS workflows**: See [minimax-tts-guide.md](minimax-tts-guide.md)
+- **Troubleshooting**: See [troubleshooting.md](troubleshooting.md)