Add Fleet control plane and split manage.sh deploy menu.

Strategy nodes gain fleet token APIs; control/ app for local ops; manage.sh offers strategy vs control one-click deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/main.py

@@ -218,6 +218,7 @@ async def index_page():
 @app.get("/stats")
 @app.get("/settings")
 @app.get("/login")
+@app.get("/fleet-login")
 async def spa_pages(full_path: str = ""):
     index = _DIST / "index.html"
     if not index.exists():