Add static color for simple devices, change auto-shutdown to auto-restore

- Add `static_color` capability to Adalight provider with `set_color()` method
- Add `static_color` field to Device model, DeviceState, and API schemas
- Add GET/PUT `/devices/{id}/color` API endpoints
- Change auto-shutdown behavior: restore device to idle state instead of
  powering off (WLED uses snapshot/restore, Adalight sends static color
  or black frame)
- Rename `_auto_shutdown_device_if_idle` to `_restore_device_idle_state`
- Add inline color picker on device cards for devices with static_color
- Add auto_shutdown toggle to device settings modal
- Update labels from "Auto Shutdown" to "Auto Restore" (en + ru)
- Remove backward-compat KC aliases from ProcessorManager
- Align card action buttons to bottom with flex column layout

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

server/tests/test_processor_manager.py

@@ -251,9 +251,11 @@ def test_get_target_metrics(processor_manager):
     assert metrics["errors_count"] == 0
 
 
-def test_is_kc_target(processor_manager):
-    """Test KC target type detection."""
+def test_target_type_detection(processor_manager):
+    """Test target type detection via processor instances."""
     from wled_controller.storage.key_colors_picture_target import KeyColorsSettings
+    from wled_controller.core.processing.kc_target_processor import KCTargetProcessor
+    from wled_controller.core.processing.wled_target_processor import WledTargetProcessor
 
     processor_manager.add_device(
         device_id="test_device",
@@ -272,8 +274,8 @@ def test_is_kc_target(processor_manager):
         settings=KeyColorsSettings(),
     )
 
-    assert processor_manager.is_kc_target("kc_target") is True
-    assert processor_manager.is_kc_target("wled_target") is False
+    assert isinstance(processor_manager._processors["kc_target"], KCTargetProcessor)
+    assert isinstance(processor_manager._processors["wled_target"], WledTargetProcessor)
 
 
 @pytest.mark.asyncio