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/atommatrix-echo-base/atommatrix_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 <esp_log.h>
 #include <driver/i2c_master.h>
@@ -101,19 +100,12 @@ 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"));
-    }
-
 public:
     AtomMatrixEchoBaseBoard() : face_button_(BOOT_BUTTON_GPIO) {
         InitializeI2c();
         I2cDetect();
         InitializePi4ioe();
         InitializeButtons();
-        InitializeIot();
     }
 
     virtual Led* GetLed() override {