Add value sources for dynamic brightness control on LED targets

Introduces a new Value Source entity that produces a scalar float (0.0-1.0)
for dynamic brightness modulation. Three subtypes: Static (constant),
Animated (sine/triangle/square/sawtooth waveform), and Audio-reactive
(RMS/peak/beat from mono audio source). Value sources can be optionally
attached to LED targets to control brightness each frame.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/api/dependencies.py

@@ -9,6 +9,7 @@ from wled_controller.storage.picture_source_store import PictureSourceStore
 from wled_controller.storage.picture_target_store import PictureTargetStore
 from wled_controller.storage.color_strip_store import ColorStripStore
 from wled_controller.storage.audio_source_store import AudioSourceStore
+from wled_controller.storage.value_source_store import ValueSourceStore
 from wled_controller.storage.profile_store import ProfileStore
 from wled_controller.core.profiles.profile_engine import ProfileEngine
 
@@ -21,6 +22,7 @@ _picture_source_store: PictureSourceStore | None = None
 _picture_target_store: PictureTargetStore | None = None
 _color_strip_store: ColorStripStore | None = None
 _audio_source_store: AudioSourceStore | None = None
+_value_source_store: ValueSourceStore | None = None
 _processor_manager: ProcessorManager | None = None
 _profile_store: ProfileStore | None = None
 _profile_engine: ProfileEngine | None = None
@@ -82,6 +84,13 @@ def get_audio_source_store() -> AudioSourceStore:
     return _audio_source_store
 
 
+def get_value_source_store() -> ValueSourceStore:
+    """Get value source store dependency."""
+    if _value_source_store is None:
+        raise RuntimeError("Value source store not initialized")
+    return _value_source_store
+
+
 def get_processor_manager() -> ProcessorManager:
     """Get processor manager dependency."""
     if _processor_manager is None:
@@ -113,13 +122,14 @@ def init_dependencies(
     picture_target_store: PictureTargetStore | None = None,
     color_strip_store: ColorStripStore | None = None,
     audio_source_store: AudioSourceStore | None = None,
+    value_source_store: ValueSourceStore | None = None,
     profile_store: ProfileStore | None = None,
     profile_engine: ProfileEngine | None = None,
 ):
     """Initialize global dependencies."""
     global _device_store, _template_store, _processor_manager
     global _pp_template_store, _pattern_template_store, _picture_source_store, _picture_target_store
-    global _color_strip_store, _audio_source_store, _profile_store, _profile_engine
+    global _color_strip_store, _audio_source_store, _value_source_store, _profile_store, _profile_engine
     _device_store = device_store
     _template_store = template_store
     _processor_manager = processor_manager
@@ -129,5 +139,6 @@ def init_dependencies(
     _picture_target_store = picture_target_store
     _color_strip_store = color_strip_store
     _audio_source_store = audio_source_store
+    _value_source_store = value_source_store
     _profile_store = profile_store
     _profile_engine = profile_engine