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/minimax-image-guide.md

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+# Image Generation Guide
+
+## CLI usage
+
+```bash
+# Basic (1:1, 1024x1024)
+python scripts/minimax_image.py "A cat astronaut floating in space" -o cat.png
+
+# 16:9 for hero banner
+python scripts/minimax_image.py "Mountain landscape at golden hour" -o hero.png --ratio 16:9
+
+# Batch: 4 images at once
+python scripts/minimax_image.py "Minimalist product icon" -o icons.png -n 4
+
+# With seed for reproducibility
+python scripts/minimax_image.py "Abstract gradient background" -o bg.png --seed 42
+
+# Enable prompt optimization
+python scripts/minimax_image.py "a dog" -o dog.png --optimize
+
+# Base64 mode (no URL download, save directly)
+python scripts/minimax_image.py "Logo concept" -o logo.png --base64
+```
+
+## Programmatic usage
+
+```python
+from minimax_image import generate_image, download_and_save
+
+# Generate and get URL
+result = generate_image("A cat in space", aspect_ratio="16:9")
+url = result["data"]["image_urls"][0]
+download_and_save(url, "cat.png")
+
+# Generate multiple
+result = generate_image("Icon design", n=4, aspect_ratio="1:1")
+for i, url in enumerate(result["data"]["image_urls"]):
+    download_and_save(url, f"icon-{i}.png")
+```
+
+## Model
+
+Currently only `image-01`.
+
+## Aspect ratios & dimensions
+
+| Ratio | Pixels | Use case |
+|-------|--------|----------|
+| `1:1` | 1024x1024 | Avatar, icon, square thumbnail |
+| `16:9` | 1280x720 | Hero banner, video thumbnail |
+| `4:3` | 1152x864 | Standard landscape |
+| `3:2` | 1248x832 | Photo-style |
+| `2:3` | 832x1248 | Portrait, mobile |
+| `3:4` | 864x1152 | Portrait card |
+| `9:16` | 720x1280 | Mobile fullscreen, story |
+| `21:9` | 1344x576 | Ultra-wide banner |
+
+Custom dimensions also supported: width/height in [512, 2048], must be divisible by 8.
+
+## Limits
+
+- Prompt: max 1,500 characters
+- Batch: 1–9 images per request
+- URL expires after 24 hours (use `--base64` to avoid expiry)
+- Seed: set for reproducible results across identical prompts