feat: 协议 V1.04 — 主动上报增加继电器输出次数 (misc_type=3)

- loop_uart_proto.h: LUP_CoilSensor.misc 联合体新增 relay_count
- tcp_json_srv.c: format_sensor_json 处理 misc_type=3 → relay_count
- docs: 更新协议文档至 V1.04

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c

@@ -950,6 +950,7 @@ static int format_sensor_json(char *buf, uint16_t buf_size, const LUP_SensorRepo
             case 0: misc_field = "\"passtime_ms5\""; misc_val = cs->misc.passtime_ms5; break;
             case 1: misc_field = "\"cut_amount\"";   misc_val = cs->misc.cut_amount;   break;
             case 2: misc_field = "\"flow_amount\"";  misc_val = cs->misc.flow_amount;  break;
+            case 3: misc_field = "\"relay_count\"";  misc_val = cs->misc.relay_count;  break;
             default: misc_field = "\"misc\"";         misc_val = 0; break;
         }