refactor(config): 重构配置系统和MQTT相关功能

移除状态发布功能，简化配置系统
更新MQTT配置和主题设置
调整README文档以反映最新变更

src/custom_robot.cpp

@@ -12,7 +12,13 @@
 namespace custom {
 
 CustomRobot::CustomRobot()
-    : initialized_(false), running_(false), controller_(nullptr), navigation_(nullptr), rsc_(nullptr), mqttClient_(nullptr) {
+    : controller_(nullptr)
+    , navigation_(nullptr)
+    , rsc_(nullptr)
+    , mqttClient_(nullptr)
+    , running_(false)
+    , initialized_(false) {
+}
     config_.loadDefaults();
     
     try {
@@ -224,7 +230,6 @@ void CustomRobot::onMqttMessage(const std::string& topic, const std::string& pay
 void CustomRobot::onMqttConnection(bool connected) {
     if (connected) {
         LOG_INFO("MQTT client connected to broker");
-        
     } else {
         LOG_WARN("MQTT client disconnected from broker");
     }