feat: handle socket reconnection after server restart

[PythonFZ]

TODO: fix / check tests

Add connect_error handler in SocketManager that re-registers users when the server rejects connection with "User not found" error. This happens when the server restarts and Redis data is cleared - the client's JWT token is still valid but the user no longer exists in Redis.

The handler:

• Detects "User not found" errors during reconnection
• Re-calls api.login() to re-register the user in Redis
• Updates the JWT token so subsequent reconnect attempts succeed

Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.12%. Comparing base (450bc3a) to head (0b63191).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #861      +/-   ##
==========================================
+ Coverage   80.01%   80.12%   +0.10%     
==========================================
  Files         165      166       +1     
  Lines       20131    20217      +86     
==========================================
+ Hits        16108    16198      +90     
+ Misses       4023     4019       -4     

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