v1.8.0: Audio 代码重构与低功耗优化 (#943)

* Reconstruct Audio Code

* Remove old IoT implementation

* Add MQTT-UDP documentation

* OTA升级失败时，可以继续使用

main/boards/sensecap-watcher/sensecap_watcher.cc

@@ -8,7 +8,6 @@
 #include "knob.h"
 #include "config.h"
 #include "led/single_led.h"
-#include "iot/thing_manager.h"
 #include "power_save_timer.h"
 #include "sscma_camera.h"
 
@@ -367,14 +366,6 @@ private:
         
     }
 
-    // 物联网初始化，添加对 AI 可见设备
-    void InitializeIot() {
-        auto& thing_manager = iot::ThingManager::GetInstance();
-        thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Screen"));
-        thing_manager.AddThing(iot::CreateThing("Battery"));
-    }
-
     uint16_t BatterygetVoltage(void) {
         static bool initialized = false;
         static adc_oneshot_unit_handle_t adc_handle;
@@ -550,7 +541,6 @@ public:
         Initializespd2010Display();
         GetBacklight()->RestoreBrightness();  // 对于不带摄像头的版本，InitializeCamera需要3s, 所以先恢复背光亮度
         InitializeCamera();
-        InitializeIot();
     }
 
     virtual AudioCodec* GetAudioCodec() override {