Fix Brain3: Lazy Tunnel Start to prevent 503

app.py

@@ -7,14 +7,28 @@ app = FastAPI()
 bridge = None
 
 @app.on_event("startup")
-def startup_event():
+async def startup_event():
     global bridge
-    print("🚀 Starting Brain3...")
-    bridge = AzureSFTPBridge()
+    print("🚀 Brain3 Starting (Lazy Bridge Mode)...")
+    # Initialize object but DO NOT start tunnel yet
+    try:
+        bridge = AzureSFTPBridge()
+        print("✅ Bridge initialized (Tunnel Pending)")
+    except Exception as e:
+        print(f"⚠️ Bridge init failed: {e}")
+
+@app.get("/start-bridge")
+def trigger_bridge():
+    """Manually start the tunnel."""
+    global bridge
+    if not bridge: return {"error": "Bridge not init"}
+    
     if os.environ.get("SSH_KEY"):
-        bridge.start_tunnel()
+        # Start in thread to not block response
+        threading.Thread(target=bridge.start_tunnel, daemon=True).start()
+        return {"status": "Tunnel starting in background..."}
     else:
-        print("⚠️ SSH_KEY missing. Bridge disabled.")
+        return {"error": "SSH_KEY missing"}
 
 @app.get("/")
 def home():