YueGuobin 67a960fbce
fix: return 503 error on MCP server ready timeout
Instead of allowing connections to proceed when server initialization
times out, return HTTP 503 Service Unavailable to prevent MCP
protocol initialization errors.

This prevents the original "Received request before initialization
was complete" errors when GNS3 server startup takes longer than
the 5-second timeout.
2026-06-06 15:23:52 +08:00
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