* docs: add OpenClaw integration tutorial
* docs: simplify OpenClaw proxy start command
* docs: rewrite OpenClaw integration guide for clarity
- Use gpt-5 as default model
- Replace poetry run with standard litellm CLI
- Add prerequisites section and verification step
- Simplify onboarding instructions (table format)
- Move manual config and troubleshooting to bottom
- Add multi-model config (claude-sonnet, gemini-flash)
* docs: fix model name in OpenClaw manual config example
* docs: rewrite OpenClaw integration guide from scratch
Rewrote the guide based on hands-on testing of every command.
Key changes:
- Replace non-existent `openclaw chat` with verified commands
(dashboard, tui, agent --agent main)
- Add 3 onboarding options: QuickStart, Manual, and non-interactive
- Fix health check (requires Bearer token)
- Remove misleading "Starting from scratch" section
- Use gpt-4o instead of gpt-5 as the example model
- Clarify that API keys can come from export, .env, or any method
- Add config reference section showing openclaw.json structure
- Add real troubleshooting based on issues found during testing
