Add Daylight Cycle value source type

New value source that outputs brightness (0-1) based on the daylight
color LUT, computing BT.601 luminance from the simulated sky color.
Supports real-time wall-clock mode or configurable simulation speed.

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

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

@@ -51,6 +51,8 @@ def _to_response(source: ValueSource) -> ValueSourceResponse:
         schedule=d.get("schedule"),
         picture_source_id=d.get("picture_source_id"),
         scene_behavior=d.get("scene_behavior"),
+        use_real_time=d.get("use_real_time"),
+        latitude=d.get("latitude"),
         description=d.get("description"),
         tags=d.get("tags", []),
         created_at=source.created_at,
@@ -99,6 +101,8 @@ async def create_value_source(
             picture_source_id=data.picture_source_id,
             scene_behavior=data.scene_behavior,
             auto_gain=data.auto_gain,
+            use_real_time=data.use_real_time,
+            latitude=data.latitude,
             tags=data.tags,
         )
         fire_entity_event("value_source", "created", source.id)
@@ -148,6 +152,8 @@ async def update_value_source(
             picture_source_id=data.picture_source_id,
             scene_behavior=data.scene_behavior,
             auto_gain=data.auto_gain,
+            use_real_time=data.use_real_time,
+            latitude=data.latitude,
             tags=data.tags,
         )
         # Hot-reload running value streams