- Replace []net.Conn slice with context + atomic counter in activeTunnel
- Use errgroup.WithContext for pipe() to handle goroutine lifecycle
- Use context.AfterFunc to close connections on cancellation
- Fix race condition by comparing tunnel pointers instead of map lookup
- UpdateLocalSNIs now cancels tunnel context instead of iterating conns
This eliminates O(n) connection removal, prevents goroutine leaks,
and provides cleaner cancellation semantics.
- Add reusable HTTP client with connection pooling for API requests
- Add sync.Pool for 32KB buffers used in connection piping
- Clear buffers before returning to pool to prevent data leakage
- Reduces GC pressure and improves throughput under load
