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/m5stack-tab5/m5stack_tab5.cc

@@ -7,7 +7,6 @@
 #include "application.h"
 #include "button.h"
 #include "config.h"
-#include "iot/thing_manager.h"
 
 #include <esp_log.h>
 #include "esp_lcd_mipi_dsi.h"
@@ -278,13 +277,6 @@ 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"));
-    }
-
 public:
     M5StackTab5Board() : boot_button_(BOOT_BUTTON_GPIO)
     {
@@ -294,7 +286,6 @@ public:
         InitializeGt911TouchPad();
         InitializeIli9881cDisplay();
         InitializeButtons();
-        InitializeIot();
         GetBacklight()->RestoreBrightness();
     }