Add stream_block example for testing HTTP streaming with VLC

Creates a new example demonstrating StreamingFlacSink usage with pmoserver
for real-world HTTP streaming testing with media players like VLC.

Features:
- Uses pmoserver instead of raw Axum for realistic testing
- Streams a single Radio Paradise block over HTTP
- Supports both pure FLAC and ICY metadata modes
- Provides /test/stream endpoint for streaming
- Provides /test/metadata endpoint for JSON metadata queries
- Includes health check endpoint

Usage:
  cargo run --example stream_block --features full -- <channel_id>

Testing with VLC:
  # Pure FLAC mode
  vlc http://localhost:8080/test/stream

  # ICY metadata mode (Now Playing)
  vlc --http-continuous --icy-metadata http://localhost:8080/test/stream

Dependencies:
- Requires pmoserver for HTTP server
- Requires StreamingFlacSink from pmoaudio-ext (http-stream feature)
- Integrated with full feature set (pmoaudio + pmoaudio-ext + pmoserver)

pmoparadise/Cargo.toml

@@ -52,7 +52,7 @@ symphonia = { version = "0.5", features = ["all"] }
 claxon = "0.4"
 
 # pmoaudio-ext with playlist support (optional for examples)
-pmoaudio-ext = { path = "../pmoaudio-ext", optional = true, features = ["playlist"] }
+pmoaudio-ext = { path = "../pmoaudio-ext", optional = true, features = ["playlist", "http-stream"] }
 
 # Common music source traits
 pmosource = { path = "../pmosource" }
@@ -91,7 +91,7 @@ cache = []
 # Active le support pmoaudio node (RadioParadiseStreamSource)
 pmoaudio = ["dep:pmoaudio", "dep:pmoflac", "dep:pmometadata", "dep:futures-util"]
 # Active le support complet avec playlist (pour les exemples avancés)
-full = ["pmoaudio", "dep:pmoaudio-ext", "pmoconfig"]
+full = ["pmoaudio", "dep:pmoaudio-ext", "pmoconfig", "dep:pmoserver"]
 
 [dev-dependencies]
 # Tests
@@ -106,3 +106,8 @@ pmoaudiocache = { path = "../pmoaudiocache" }
 [[example]]
 name = "now_playing"
 path = "examples/now_playing.rs"
+
+[[example]]
+name = "stream_block"
+path = "examples/stream_block.rs"
+required-features = ["full"]