feat(us-021): --route-timeout CLI flag for node tracker route lookup

Default 30s replaces the hardcoded 5s. Wired through TorchNodeServer →
_TorchHTTPServer → _get_remaining_route. Available on both the legacy
`start` subcommand and the default wizard path.

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

packages/node/meshnet_node/startup.py

@@ -111,6 +111,7 @@ def run_startup(
     host: str = "127.0.0.1",
     advertise_host: str | None = None,
     contracts: Any | None = None,
+    route_timeout: float = 30.0,
 ) -> StubNodeServer | TorchNodeServer:
     """Execute the full startup sequence and return a running node server.
 
@@ -202,6 +203,7 @@ def run_startup(
             shard_end=shard_end,
             quantization=quantization,
             tracker_url=tracker_url,
+            route_timeout=route_timeout,
         )
         actual_port = node.start()
         total_layers = getattr(getattr(node, "backend", None), "total_layers", None)
@@ -285,6 +287,7 @@ def run_startup(
             shard_end=assigned_shard_end,
             quantization=quantization,
             tracker_url=tracker_url,
+            route_timeout=route_timeout,
         )
         actual_port = node.start()
         public_host = advertise_host or (socket.getfqdn() if host == "0.0.0.0" else host)