tunnel retries on connection loss + better cleanup

[kcoopermiller]

Note

Medium Risk
Moderate risk because it changes tunnel lifecycle/cleanup behavior via atexit hooks and alters frpc reconnection behavior, which could impact process teardown or long-running tunnel stability.

Overview
Improves tunnel robustness by configuring frpc to keep retrying after losing the server connection (loginFailExit = false) instead of exiting.

Adds an atexit hook to automatically call Tunnel.sync_stop() after a successful start, and ensures the hook is unregistered on both async stop() and sync_stop() to avoid double-cleanup or lingering handlers.

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[chatgpt-codex-connector]

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