feat: Add RadioParadiseStreamSource - pmoaudio node for Radio Paradise

Implement a new pmoaudio source node that streams Radio Paradise blocks
with automatic TrackBoundary insertion at the correct timing.

Features:
- Downloads and decodes FLAC blocks from Radio Paradise API
- Queue management for block IDs via push_block_id()
- Recent blocks cache (10 blocks) to avoid re-downloads
- Automatic TrackBoundary insertion based on sample count timing
- Converts Song metadata to TrackMetadata with cover URLs
- Timeout of 3 seconds for new block IDs (radio real-time)
- Support for 16-bit and 24-bit FLAC audio

Architecture:
- RadioParadiseStreamSourceLogic: Pure business logic implementing NodeLogic
- RadioParadiseStreamSource: Wrapper using Node<> pattern
- Uses logic_mut() for push_block_id() configuration

The node emits:
- TopZeroSync at block start
- TrackBoundary before each song (with same order as next chunk)
- Audio chunks (I16 or I24)
- EndOfStream on timeout or completion

New pmoaudio feature gate with dependencies on:
- pmoaudio, pmoflac, pmometadata, futures-util

pmoparadise/Cargo.toml

@@ -74,6 +74,12 @@ pmoserver = { path = "../pmoserver", optional = true }
 utoipa = { version = "5.4.0", optional = true }
 axum = { version = "0.8.4", optional = true }
 
+# pmoaudio node support
+pmoaudio = { path = "../pmoaudio", optional = true }
+pmoflac = { path = "../pmoflac", optional = true }
+pmometadata = { path = "../pmometadata", optional = true }
+futures-util = { version = "0.3", optional = true }
+
 [features]
 default = ["metadata-only", "pmoconfig"]
 # Mode métadonnées seules (pas de décodage FLAC)
@@ -90,6 +96,8 @@ pmoconfig = ["dep:pmoconfig"]
 cache = []
 # Active le streaming progressif avec FFmpeg (latence réduite)
 ffmpeg = ["dep:ffmpeg-next"]
+# Active le support pmoaudio node (RadioParadiseStreamSource)
+pmoaudio = ["dep:pmoaudio", "dep:pmoflac", "dep:pmometadata", "dep:futures-util"]
 
 [dev-dependencies]
 # Tests