feat(portal): mount V3 dashboard on main domain https://nav.961504.xyz (port 3002)

stacks/portal/server.py

@@ -320,6 +320,9 @@ class PortalHandler(BaseHTTPRequestHandler):
 
 
 if __name__ == "__main__":
-    server = ThreadingHTTPServer(("0.0.0.0", PORT), PortalHandler)
-    print(f"[HomeLab Portal] Listening on http://0.0.0.0:{PORT}")
+    # 同时监听主入口 3002 (https://nav.961504.xyz) 与预览端口 3004
+    srv_preview = ThreadingHTTPServer(("0.0.0.0", 3004), PortalHandler)
+    threading.Thread(target=srv_preview.serve_forever, daemon=True).start()
+    server = ThreadingHTTPServer(("0.0.0.0", 3002), PortalHandler)
+    print("[HomeLab Portal V3] Listening on http://0.0.0.0:3002 and :3004")
     server.serve_forever()