Refactor WebRenderer to use server-side streaming with OGG-FLAC sink

This commit refactors the WebRenderer to use a server-side streaming architecture with OGG-FLAC sink instead of the previous WebSocket-based approach. The changes include:

- Replaced WebSocket communication with HTTP streaming using DirectOggFlacSink
- Implemented a new pipeline architecture with dedicated handlers for UPnP commands
- Added new modules for registration, registry, and streaming
- Updated the renderer to work with a pipeline control system
- Removed old WebSocket session management
- Added support for HTTP streaming with gapless playback
- Updated dependencies and features for the new architecture

The WebRenderer now acts as a MediaRenderer UPnP device that serves audio streams via HTTP endpoints, with commands relayed to the audio pipeline through a new control system.

pmoaudio/src/lib.rs

@@ -126,6 +126,7 @@ pub use nodes::{
     resampling_node::ResamplingNode,
     timer_buffer_node::TimerBufferNode,
     timer_node::TimerNode,
+    position_tracker_node::{PositionHandle, PositionTrackerNode},
     AudioError, AudioNode, TypedAudioNode,
 };