Add adaptive brightness value source with time-of-day and scene modes

New "adaptive" value source type that automatically adjusts brightness
based on external conditions. Two sub-modes: time-of-day (schedule-based
interpolation with midnight wrap) and scene brightness (frame luminance
analysis via numpy BT.601 subsampling with EMA smoothing).

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

server/src/wled_controller/api/routes/value_sources.py

@@ -43,6 +43,10 @@ def _to_response(source: ValueSource) -> ValueSourceResponse:
         mode=d.get("mode"),
         sensitivity=d.get("sensitivity"),
         smoothing=d.get("smoothing"),
+        adaptive_mode=d.get("adaptive_mode"),
+        schedule=d.get("schedule"),
+        picture_source_id=d.get("picture_source_id"),
+        scene_behavior=d.get("scene_behavior"),
         description=d.get("description"),
         created_at=source.created_at,
         updated_at=source.updated_at,
@@ -86,6 +90,10 @@ async def create_value_source(
             sensitivity=data.sensitivity,
             smoothing=data.smoothing,
             description=data.description,
+            adaptive_mode=data.adaptive_mode,
+            schedule=data.schedule,
+            picture_source_id=data.picture_source_id,
+            scene_behavior=data.scene_behavior,
         )
         return _to_response(source)
     except ValueError as e:
@@ -129,6 +137,10 @@ async def update_value_source(
             sensitivity=data.sensitivity,
             smoothing=data.smoothing,
             description=data.description,
+            adaptive_mode=data.adaptive_mode,
+            schedule=data.schedule,
+            picture_source_id=data.picture_source_id,
+            scene_behavior=data.scene_behavior,
         )
         # Hot-reload running value streams
         pm.update_value_source(source_id)