Add searxng skill with portable configuration

skills/searxng/SKILL.md

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+---
+name: searxng
+description: Search the web through a local or self-hosted SearXNG instance. Use when you want privacy-respecting web, image, video, or news search without external search API keys, via scripts/searxng.py.
+---
+
+# SearXNG Search
+
+Use `scripts/searxng.py` to run searches against a SearXNG instance.
+
+## Requirements
+
+Required runtime:
+- `python3`
+- Python packages: `httpx`, `rich`
+
+Configuration lookup order:
+1. `SEARXNG_URL` environment variable
+2. workspace `.clawdbot/credentials/searxng/config.json` found by walking upward from the script location
+3. `~/.clawdbot/credentials/searxng/config.json`
+4. fallback: `http://localhost:8080`
+
+Config file shape if used:
+
+```json
+{
+  "url": "https://search.example.com"
+}
+```
+
+## Usage
+
+Examples:
+
+```bash
+python3 scripts/searxng.py search "OpenClaw" -n 5
+python3 scripts/searxng.py search "latest AI news" --category news -n 10
+python3 scripts/searxng.py search "cute cats" --category images --format json
+python3 scripts/searxng.py search "rust tutorial" --language en --time-range month
+```
+
+## Notes
+
+- Uses the SearXNG JSON API endpoint at `<SEARXNG_URL>/search`.
+- HTTPS certificate verification is disabled in the current script for compatibility with local/self-signed instances.
+- If connection fails, the script prints the URL it attempted.
+- `--format json` is best for programmatic use; table output is best for humans.