feat: 新增MQTT配置类和服务

- AiMqttConfig: MQTT连接参数配置（broker/认证/topic前缀/QoS等）
- MqttService: MQTT连接管理、消息发布/订阅、自动重连、配置推送封装

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/main/java/com/genersoft/iot/vmp/aiot/config/AiMqttConfig.java

@@ -0,0 +1,29 @@
+package com.genersoft.iot.vmp.aiot.config;
+
+import lombok.Data;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Data
+@Component
+@ConfigurationProperties(prefix = "ai.mqtt")
+public class AiMqttConfig {
+
+    private boolean enabled = false;
+
+    private String broker = "tcp://127.0.0.1:1883";
+
+    private String clientId = "wvp-server";
+
+    private String username = "wvp";
+
+    private String password = "wvp123";
+
+    private String topicPrefix = "ai/config";
+
+    private int qos = 1;
+
+    private int connectTimeout = 10;
+
+    private int keepAlive = 60;
+}

src/main/java/com/genersoft/iot/vmp/aiot/service/MqttService.java

@@ -0,0 +1,158 @@
+package com.genersoft.iot.vmp.aiot.service;
+
+import com.genersoft.iot.vmp.aiot.config.AiMqttConfig;
+import jakarta.annotation.PostConstruct;
+import jakarta.annotation.PreDestroy;
+import lombok.extern.slf4j.Slf4j;
+import org.eclipse.paho.mqttv5.client.*;
+import org.eclipse.paho.mqttv5.client.persist.MemoryPersistence;
+import org.eclipse.paho.mqttv5.common.MqttException;
+import org.eclipse.paho.mqttv5.common.MqttMessage;
+import org.eclipse.paho.mqttv5.common.MqttSubscription;
+import org.eclipse.paho.mqttv5.common.packet.MqttProperties;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.nio.charset.StandardCharsets;
+import java.util.function.BiConsumer;
+
+@Slf4j
+@Service
+public class MqttService {
+
+    @Autowired
+    private AiMqttConfig mqttConfig;
+
+    private MqttAsyncClient client;
+
+    @PostConstruct
+    public void init() {
+        if (!mqttConfig.isEnabled()) {
+            log.info("MQTT未启用，跳过初始化");
+            return;
+        }
+        try {
+            connect();
+        } catch (Exception e) {
+            log.error("MQTT初始化失败", e);
+        }
+    }
+
+    private void connect() throws MqttException {
+        client = new MqttAsyncClient(mqttConfig.getBroker(), mqttConfig.getClientId(), new MemoryPersistence());
+
+        MqttConnectionOptions options = new MqttConnectionOptions();
+        options.setUserName(mqttConfig.getUsername());
+        options.setPassword(mqttConfig.getPassword().getBytes(StandardCharsets.UTF_8));
+        options.setConnectionTimeout(mqttConfig.getConnectTimeout());
+        options.setKeepAliveInterval(mqttConfig.getKeepAlive());
+        options.setAutomaticReconnect(true);
+        options.setCleanStart(true);
+
+        client.setCallback(new MqttCallback() {
+            @Override
+            public void disconnected(MqttDisconnectResponse response) {
+                log.warn("MQTT连接断开: {}", response.getReasonString());
+            }
+
+            @Override
+            public void mqttErrorOccurred(MqttException exception) {
+                log.error("MQTT错误", exception);
+            }
+
+            @Override
+            public void messageArrived(String topic, MqttMessage message) {
+                log.debug("收到MQTT消息: topic={}, payload={}", topic, new String(message.getPayload(), StandardCharsets.UTF_8));
+            }
+
+            @Override
+            public void deliveryComplete(IMqttToken token) {
+                log.debug("MQTT消息投递完成");
+            }
+
+            @Override
+            public void connectComplete(boolean reconnect, String serverURI) {
+                log.info("MQTT{}连接成功: {}", reconnect ? "重新" : "", serverURI);
+            }
+
+            @Override
+            public void authPacketArrived(int reasonCode, MqttProperties properties) {
+            }
+        });
+
+        client.connect(options).waitForCompletion();
+        log.info("MQTT连接成功: broker={}, clientId={}", mqttConfig.getBroker(), mqttConfig.getClientId());
+    }
+
+    public void publish(String topic, String payload, int qos) {
+        if (client == null || !client.isConnected()) {
+            throw new RuntimeException("MQTT客户端未连接");
+        }
+        try {
+            MqttMessage message = new MqttMessage(payload.getBytes(StandardCharsets.UTF_8));
+            message.setQos(qos);
+            client.publish(topic, message).waitForCompletion();
+            log.info("MQTT消息发布成功: topic={}", topic);
+        } catch (MqttException e) {
+            log.error("MQTT消息发布失败: topic={}", topic, e);
+            throw new RuntimeException("MQTT发布失败: " + e.getMessage());
+        }
+    }
+
+    public void subscribe(String topic, int qos, BiConsumer<String, String> callback) {
+        if (client == null || !client.isConnected()) {
+            throw new RuntimeException("MQTT客户端未连接");
+        }
+        try {
+            MqttSubscription subscription = new MqttSubscription(topic, qos);
+            client.subscribe(new MqttSubscription[]{subscription}, null, null, new MqttCallback() {
+                @Override
+                public void disconnected(MqttDisconnectResponse response) {}
+
+                @Override
+                public void mqttErrorOccurred(MqttException exception) {}
+
+                @Override
+                public void messageArrived(String t, MqttMessage message) {
+                    String payload = new String(message.getPayload(), StandardCharsets.UTF_8);
+                    callback.accept(t, payload);
+                }
+
+                @Override
+                public void deliveryComplete(IMqttToken token) {}
+
+                @Override
+                public void connectComplete(boolean reconnect, String serverURI) {}
+
+                @Override
+                public void authPacketArrived(int reasonCode, MqttProperties properties) {}
+            }, new MqttProperties());
+            log.info("MQTT订阅成功: topic={}", topic);
+        } catch (MqttException e) {
+            log.error("MQTT订阅失败: topic={}", topic, e);
+            throw new RuntimeException("MQTT订阅失败: " + e.getMessage());
+        }
+    }
+
+    public void pushConfig(String cameraId, String configJson) {
+        String topic = mqttConfig.getTopicPrefix() + "/" + cameraId + "/push";
+        publish(topic, configJson, mqttConfig.getQos());
+    }
+
+    public boolean isConnected() {
+        return client != null && client.isConnected();
+    }
+
+    @PreDestroy
+    public void destroy() {
+        if (client != null && client.isConnected()) {
+            try {
+                client.disconnect().waitForCompletion();
+                client.close();
+                log.info("MQTT连接已关闭");
+            } catch (MqttException e) {
+                log.error("MQTT关闭失败", e);
+            }
+        }
+    }
+}