umputun / stash / 20686790533

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feat(sse): add real-time key change subscriptions via Server-Sent Events

- add SSE service with topic-based pub/sub for key change events
- support exact key (/subscribe/key) and prefix patterns (/subscribe/prefix/ or /subscribe/prefix/*)
- use http.ResponseController to disable WriteTimeout for long-lived connections
- publish create/update/delete events from API and web handlers
- add Go client library with Subscribe, SubscribePrefix, SubscribeAll methods
- integrate with auth system for permission-based filtering
- add integration tests for SSE subscriptions

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