fix: default Ollama endpoints to localhost instead of 192.168.0.240 (#98)

The hardcoded 192.168.0.240 IP was a developer-specific LAN address
that breaks out-of-the-box for anyone running Ollama locally or via
WSL2 on Windows. Switch every default and docstring reference to
localhost so the project works without manual configuration.

Files changed:
- coach/config.py: LLM_URL and DECK_GEN_BASE_URL defaults
- ui/simulator.html: API endpoint input value and placeholder
- lab_api.py: remove LAN IP from default CORS origins
- routes/coach.py: warning message text
- src/commander_ai_lab/sim/deepseek_brain.py: docstrings
- src/commander_ai_lab/sim/deepseek_engine.py: docstring example
- src/commander_ai_lab/sim/validator_brain.py: docstring example

Co-authored-by: Claude Code <noreply@anthropic.com>

lab_api.py

@@ -45,7 +45,7 @@ from routes.ml import router as ml_router
 log = logging.getLogger("commander_ai_lab.api")
 
 # ── CORS origins (env-configurable) ────────────────────────────
-_DEFAULT_ORIGINS = "http://localhost:5173,http://localhost:8080,http://192.168.0.240:5173,http://192.168.0.240:8080"
+_DEFAULT_ORIGINS = "http://localhost:5173,http://localhost:8080"
 _allowed = os.environ.get("ALLOWED_ORIGINS", _DEFAULT_ORIGINS)
 allowed_origins = [o.strip() for o in _allowed.split(",") if o.strip()]