fix(core): allocate standalone WebSocket ports atomically

[webfansplz]

Vite DevTools previously selected a standalone WebSocket port with get-port-please before starting the server. Concurrent processes could probe the same available port and then race to bind it, causing all but one to fail with EADDRINUSE.

Default port allocation is now delegated to the Devframe transport, which binds to port 0 and lets the operating system select and reserve an available port atomically.

Changes

• remove the probe-before-bind port allocation from the standalone WebSocket path
• wait for the Devframe transport to start listening
• retrieve the actual bound port from the transport
• publish the WebSocket endpoint and refresh remote docks after the port is resolved
• preserve explicitly configured ports
• keep the shared Vite HTTP server path unchanged

Standalone environments that require a stable port can continue to configure websocket.port explicitly.

Waitting for devframes/devframe#171, Fix #517

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commit: fbde652

[Copilot]

Pull request overview

This PR fixes a race condition in standalone WebSocket port selection for Vite DevTools by removing probe-before-bind logic and relying on the underlying Devframe WS transport to bind atomically (port 0 → OS-assigned port), then publishing the resolved endpoint for remote docks.

Changes:

• Remove get-port-please pre-allocation and delegate default standalone port selection to the Devframe transport.
• Await transport readiness and read back the actual bound port from transport.address().
• Publish the resolved WS endpoint and re-emit remote dock update events once the endpoint is known.

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