Add searxng skill with portable configuration

docs/searxng.md

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+# searxng
+
+Search the web through a local or self-hosted SearXNG instance.
+
+## What this skill is for
+
+- General web search
+- News, image, and video search
+- Privacy-respecting search without external API keys
+- Programmatic search output via JSON
+
+## Runtime requirements
+
+- `python3`
+- Python packages: `httpx`, `rich`
+
+## Configuration
+
+Preferred:
+
+- `SEARXNG_URL` environment variable
+
+Optional config file:
+
+- workspace `.clawdbot/credentials/searxng/config.json`
+- or `~/.clawdbot/credentials/searxng/config.json`
+
+Example:
+
+```json
+{
+  "url": "https://search.fiorinis.com"
+}
+```
+
+## Wrapper
+
+Use the bundled script directly:
+
+```bash
+python3 skills/searxng/scripts/searxng.py search "OpenClaw" -n 5
+python3 skills/searxng/scripts/searxng.py search "latest AI news" --category news
+python3 skills/searxng/scripts/searxng.py search "OpenClaw" --format json
+```
+
+## Notes
+
+- Falls back to `http://localhost:8080` if no URL is configured.
+- Prints the URL it attempted when connection fails.
+- Uses the SearXNG JSON API endpoint.