Implement num lock light for Keychron V5 (#26019)

keyboards/keychron/v5/ansi/config.h

@@ -18,3 +18,6 @@
 
 /* Enable caps-lock LED */
 #define CAPS_LOCK_LED_INDEX 54
+
+/* Enable num-lock LED */
+#define NUM_LOCK_LED_INDEX 33

keyboards/keychron/v5/ansi_encoder/config.h

@@ -21,3 +21,6 @@
 
 /* Enable caps-lock LED */
 #define CAPS_LOCK_LED_INDEX 52
+
+/* Enable num-lock LED */
+#define NUM_LOCK_LED_INDEX 31

keyboards/keychron/v5/iso/config.h

@@ -18,3 +18,6 @@
 
 /* Enable caps-lock LED */
 #define CAPS_LOCK_LED_INDEX 53
+
+/* Enable num-lock LED */
+#define NUM_LOCK_LED_INDEX 33

keyboards/keychron/v5/iso_encoder/config.h

@@ -21,3 +21,6 @@
 
 /* Enable caps-lock LED */
 #define CAPS_LOCK_LED_INDEX 51
+
+/* Enable num-lock LED */
+#define NUM_LOCK_LED_INDEX 31

keyboards/keychron/v5/v5.c

@@ -30,7 +30,7 @@ bool dip_switch_update_kb(uint8_t index, bool active) {
 
 #endif  // DIP_SWITCH_ENABLE
 
-#if defined(RGB_MATRIX_ENABLE) && defined(CAPS_LOCK_LED_INDEX)
+#if defined(RGB_MATRIX_ENABLE) && (defined(CAPS_LOCK_LED_INDEX) || defined(NUM_LOCK_LED_INDEX))
 
 bool process_record_kb(uint16_t keycode, keyrecord_t *record) {
     if (!process_record_user(keycode, record)) { return false; }
@@ -69,6 +69,15 @@ bool rgb_matrix_indicators_advanced_kb(uint8_t led_min, uint8_t led_max) {
            RGB_MATRIX_INDICATOR_SET_COLOR(CAPS_LOCK_LED_INDEX, 0, 0, 0);
         }
     }
+    #ifdef NUM_LOCK_LED_INDEX
+    if (host_keyboard_led_state().num_lock) {
+        RGB_MATRIX_INDICATOR_SET_COLOR(NUM_LOCK_LED_INDEX, 255, 255, 255);
+    } else {
+        if (!rgb_matrix_get_flags()) {
+           RGB_MATRIX_INDICATOR_SET_COLOR(NUM_LOCK_LED_INDEX, 0, 0, 0);
+        }
+    }
+    #endif
     return true;
 }