fix: auto-load .env via python-dotenv for dashboard API keys

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/world_intel_mcp/dashboard/app.py

@@ -10,6 +10,9 @@ import logging
 from datetime import datetime, timezone
 from pathlib import Path
 
+from dotenv import load_dotenv
+load_dotenv(Path(__file__).resolve().parents[3] / ".env", override=False)
+
 from starlette.applications import Starlette
 from starlette.responses import HTMLResponse, JSONResponse, Response, StreamingResponse
 from starlette.routing import Route