🧪 Add test for Logout

[google-labs-jules]

🎯 What: Replaced empty dummy tests for the Logout handler in apps/server/internal/modules/auth/handler_test.go with actual HTTP tests that mock the request context using httptest.NewRecorder() and verify the behavior of clearAuthCookies.
📊 Coverage: Now tests the exact header updates, checking that Set-Cookie correctly sets access_token and refresh_token to be cleared (MaxAge=-1), and verifies that the response is 200 OK with success: true.
✨ Result: Improved test coverage and reliability for authentication cleanup. This guarantees that user tokens are correctly revoked from the client upon logging out.

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PR created automatically by Jules for task 10177812471151095806 started by @Gautam7352

[google-labs-jules]

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