Add SET_LIGHTING (0xB1) and AC22-style init LED shimmer.

Mutable status palette over serial; Unknown uses HSV saturation pulse instead of dim-red/fade-to-black.

Co-authored-by: Cursor <cursoragent@cursor.com>

Core/Inc/rgb_controller.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "main.h"
+#include "serial_control.h"
 
 #pragma pack(push, 1)
 
@@ -40,6 +41,7 @@ typedef struct{
 void LED_Task();
 void LED_Write();
 void LED_Init();
-void LED_SetColor(RGB_Cycle_t *color);
+void LED_SetColor(const RGB_Cycle_t *color);
 void RGB_SetColor(RGB_t *color);
 void WS2812_SetColor(RGB_t *color);
+uint8_t LED_ApplyLightingConfig(const LightingConfigPacket_t *config);