bug: init command hardcodes LLM config in config.md instead of using setup results

[FreeTurtle7]

In src/cli/init.ts, the config.md generation hardcodes the LLM provider and model instead of using the values selected during the runSetup phase.

Current code:

        const configLines = [
          "# FreeTurtle Config\n",
          "## LLM",
          "- provider: claude_api",
          "- model: claude-sonnet-4-5",
          ...

Expected behavior:
It should use state.setupResult.provider and state.setupResult.model to ensure the config matches the .env and the user's choice.