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/atoms3r-cam-m12-echo-base/atoms3r_cam_m12_echo_base.cc

@@ -1,10 +1,9 @@
 #include "wifi_board.h"
-#include "audio_codecs/es8311_audio_codec.h"
+#include "codecs/es8311_audio_codec.h"
 #include "application.h"
 #include "button.h"
 #include "config.h"
 #include "i2c_device.h"
-#include "iot/thing_manager.h"
 #include "assets/lang_config.h"
 
 #include <esp_log.h>
@@ -157,12 +156,6 @@ private:
         camera_->SetHMirror(false);
     }
 
-    // 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"));
-    }
-
     virtual Camera* GetCamera() override {
         return camera_;
     }
@@ -174,7 +167,6 @@ public:
         I2cDetect();
         CheckEchoBaseConnection();
         InitializePi4ioe();
-        InitializeIot();
     }
 
     virtual AudioCodec* GetAudioCodec() override {