The streaming FLAC implementation was experiencing severe lag warnings
(clients skipping 700-2200 messages) because:
1. The broadcast channel capacity (512) was too small for network backpressure
2. The pipeline had no rate limiting, sending data faster than real-time
Changes:
- Increased BROADCAST_CAPACITY from 512 to 4096 (~5min buffer)
- Added TimerNode (3s lead time) to stream_block example pipeline
- Pipeline now: RadioParadiseStreamSource → TimerNode → StreamingFlacSink
This ensures data flows at real-time playback speed with sufficient
buffering for network jitter, eliminating client lag warnings.
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