umputun / stash / 19778689720

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feat(auth): add hot-reload support for auth configuration (#20)

Add fsnotify-based file watching to automatically reload auth config
when the file changes. This allows updating users, tokens, and permissions
without restarting the server.

- Add RWMutex for thread-safe config access during reload
- Add Reload() method to reload config and invalidate all sessions
- Add StartWatcher() using fsnotify to watch directory (handles atomic renames)
- Add --auth.hot-reload CLI flag and STASH_AUTH_HOT_RELOAD env var
- Wrap all config read operations with RLock/RUnlock
- Invalid config changes are rejected, existing config preserved

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