OAuth refresh goes deadloop loop

[AlexMKX]

In case server is unavailable or token refresh is not successfull somehow, the server goes infinite loop and spamming logs despite the server is disabled. The only solution is to restart mcpproxy itself.

2026-02-28T17:56:06.836421+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[33mWARN#033[0m#011refresh-manager#011oauth/refresh_manager.go:642#011OAuth token refresh failed#011{"server": "gcw2", "err
or": "failed to refresh OAuth token: server not found: gcw2", "error_type": "failed_other", "retry_count": 23158726}
2026-02-28T17:56:06.836444+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[34mINFO#033[0m#011refresh-manager#011oauth/refresh_manager.go:747#011OAuth token refresh retry scheduled#011{"server": "gc
w2", "delay": "0s", "next_attempt": "2026-02-28 17:56:06", "retry_count": 23158726, "refresh_state": "retrying"}
2026-02-28T17:56:06.836476+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[34mINFO#033[0m#011refresh-manager#011oauth/refresh_manager.go:837#011Executing proactive token refresh#011{"server": "gcw2
"}
2026-02-28T17:56:06.836506+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[33mWARN#033[0m#011refresh-manager#011oauth/refresh_manager.go:642#011OAuth token refresh failed#011{"server": "gcw2", "err
or": "failed to refresh OAuth token: server not found: gcw2", "error_type": "failed_other", "retry_count": 23158727}
2026-02-28T17:56:06.836558+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[34mINFO#033[0m#011refresh-manager#011oauth/refresh_manager.go:747#011OAuth token refresh retry scheduled#011{"server": "gc
w2", "delay": "0s", "next_attempt": "2026-02-28 17:56:06", "retry_count": 23158727, "refresh_state": "retrying"}
2026-02-28T17:56:06.836616+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[34mINFO#033[0m#011refresh-manager#011oauth/refresh_manager.go:837#011Executing proactive token refresh#011{"server": "gcw2
"}
2026-02-28T17:56:06.836675+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[33mWARN#033[0m#011refresh-manager#011oauth/refresh_manager.go:642#011OAuth token refresh failed#011{"server": "gcw2", "err
or": "failed to refresh OAuth token: server not found: gcw2", "error_type": "failed_other", "retry_count": 23158728}
2026-02-28T17:56:06.836740+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[34mINFO#033[0m#011refresh-manager#011oauth/refresh_manager.go:747#011OAuth token refresh retry scheduled#011{"server": "gc
w2", "delay": "0s", "next_attempt": "2026-02-28 17:56:06", "retry_count": 23158728, "refresh_state": "retrying"}
2026-02-28T17:56:06.836796+03:00 lingfn mcpproxy[1885]: 2026-02-28 17:56:06#011#033[34mINFO#033[0m#011refresh-manager#011oauth/refresh_manager.go:837#011Executing proactive token refresh#011{"server": "gcw2
"}

Suggested solution:

1. Stop refreshes if server is disabled.
2. Use sleep or timer for token refreshes.