Add Socket.IO Authorization and Event Integration Tests

[grantfox-oss]

Description:
No tests cover your real-time layer. Add integration tests for Socket.IO auth, join/leave campaign rooms, and receiving donation or distribution events in socket.server.ts.

[GBOYEE]

Hi! I'd like to work on this issue.

I have experience with this stack and can deliver a clean, tested solution. Please assign this to me and I'll submit a PR shortly.

My approach:

• Analyze the root cause
• Implement a fix following existing code patterns
• Add tests and documentation

Thanks!