fix: connect error when sse with multiple clients

[hustcc]

• fixed 这个mcp两个client同时连接第2个会阻塞 #232

[gemini-code-assist]

Summary of Changes

Hello @hustcc, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical issue preventing multiple clients from simultaneously connecting via Server-Sent Events (SSE). The solution involves refactoring the server setup to ensure each client connection operates with its own isolated server instance, thereby eliminating resource contention. The changes are validated with new tests specifically designed to confirm stable multi-client SSE and streamable connections.

Highlights

• Fix for Multiple SSE Clients: The core issue preventing multiple clients from simultaneously connecting via Server-Sent Events (SSE) has been resolved.
• Per-Connection Server Instance: Each new SSE client connection now receives its own dedicated server instance, effectively preventing resource conflicts and enabling concurrent connections.
• New Multi-Client Tests: Comprehensive new tests have been added to validate the stability and functionality of both SSE and streamable connections when multiple clients are active.
• Increased Test Timeouts: Test execution timeouts have been extended to accommodate the new, potentially longer-running multi-client integration tests.

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[gemini-code-assist]

Code Review

This pull request effectively resolves the connection error for multiple SSE clients by instantiating a new server for each connection. The core logic change is sound and well-implemented in src/server.ts and src/services/sse.ts. I appreciate the addition of new tests in __tests__/server.spec.ts to cover multiple client scenarios for both SSE and streamable transports, which will help prevent future regressions. I have one suggestion to refactor the new tests to reduce code duplication and improve maintainability.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.69%. Comparing base (0df6ba0) to head (028165f).

Files with missing lines	Patch %	Lines
src/services/sse.ts	0.00%	6 Missing ⚠️
src/server.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #233   +/-   ##
=======================================
  Coverage   79.69%   79.69%           
=======================================
  Files          41       41           
  Lines        1788     1788           
  Branches       31       31           
=======================================
  Hits         1425     1425           
  Misses        361      361           
  Partials        2        2           

Files with missing lines	Coverage Δ
src/server.ts	0.00% <0.00%> (ø)
src/services/sse.ts	2.12% <0.00%> (-0.05%)	⬇️

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