feat(local): single-process run — backend serves built UI + start_local.bat

- app.py mounts frontend/dist (if present) so 'python -m uvicorn app:app'
  serves the UI + API + the real BAR launch from one process (no Node at
  runtime). Skipped on the cloud backend where dist isn't deployed.
- start_local.bat: one-click local launch (opens http://localhost:8000).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rlafurud

backend/app.py

@@ -25,6 +25,7 @@
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
 from pydantic import BaseModel
 
 import pipeline
@@ -172,6 +173,16 @@ def launch(req: LaunchRequest):
     }
 
 
+# Serve the built frontend if present, so `start_local` can run the whole app
+# (UI + API + BAR launch) as a single Python process — no Node needed at run
+# time. On the cloud backend dist isn't deployed, so this is skipped and the API
+# runs alone (the frontend is hosted separately on Vercel). Mounted LAST so the
+# API routes above always take precedence.
+_DIST = CURRENT_DIR.parent / "frontend" / "dist"
+if _DIST.is_dir():
+    app.mount("/", StaticFiles(directory=str(_DIST), html=True), name="spa")
+
+
 if __name__ == "__main__":
     import uvicorn
     uvicorn.run("app:app", host="0.0.0.0", port=8000, reload=True)

start_local.bat

@@ -0,0 +1,20 @@
+@echo off
+REM ============================================================
+REM  RTSGame - one-click LOCAL run (Windows)
+REM  Backend serves the API + the built UI + the real "BAR에서 실행".
+REM  Requires: Python on PATH, backend\.env with OPENAI_API_KEY,
+REM            frontend\dist built (npm run build), and BAR installed.
+REM  Open http://localhost:8000 when it starts.
+REM ============================================================
+cd /d "%~dp0backend"
+
+if not exist "..\frontend\dist\index.html" (
+  echo [!] frontend\dist not found. Build it once with:  cd frontend ^&^& npm run build
+  echo     ^(API will still run, but the UI page will be missing.^)
+)
+
+REM open the browser a few seconds after the server starts
+start "" cmd /c "timeout /t 4 >nul & start http://localhost:8000"
+
+echo Starting RTSGame on http://localhost:8000  (close this window to stop)
+python -m uvicorn app:app --host 127.0.0.1 --port 8000