feat(integration): 添加消息服务相关接口和功能

- 新增 MessageController 类，实现消息列表查询和消息通道列表获取功能
- 新增 MessageClient 接口，用于调用消息服务的 Feign客户端
- 新增 ChannelsResponse、MessageListData 和 MessageRecordDTO 数据传输对象
- 新增 MessageIntegrationService 服务类，处理消息服务相关业务逻辑

src/main/java/com/ycwl/basic/controller/pc/MessageController.java

@@ -0,0 +1,60 @@
+package com.ycwl.basic.controller.pc;
+
+import com.ycwl.basic.integration.message.dto.ChannelsResponse;
+import com.ycwl.basic.integration.message.dto.MessageListData;
+import com.ycwl.basic.integration.message.service.MessageIntegrationService;
+import com.ycwl.basic.utils.ApiResponse;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@Slf4j
+@RestController
+@RequestMapping("/api/message/v1")
+@RequiredArgsConstructor
+public class MessageController {
+
+    private final MessageIntegrationService messageService;
+
+    @GetMapping("/messages")
+    public ApiResponse<MessageListData> listMessages(
+            @RequestParam(defaultValue = "1") Integer page,
+            @RequestParam(defaultValue = "20") Integer pageSize,
+            @RequestParam(required = false) String channelId,
+            @RequestParam(required = false) String title,
+            @RequestParam(required = false) String content,
+            @RequestParam(required = false) String sendBiz,
+            @RequestParam(required = false) String sentAtStart,
+            @RequestParam(required = false) String sentAtEnd,
+            @RequestParam(required = false) String createdAtStart,
+            @RequestParam(required = false) String createdAtEnd
+    ) {
+        log.info("PC|消息列表查询 page={}, pageSize={}, channelId={}, title={}, sendBiz={}", page, pageSize, channelId, title, sendBiz);
+        if (pageSize > 100) {
+            pageSize = 100;
+        }
+        try {
+            MessageListData data = messageService.listMessages(page, pageSize, channelId, title, content, sendBiz,
+                    sentAtStart, sentAtEnd, createdAtStart, createdAtEnd);
+            return ApiResponse.success(data);
+        } catch (Exception e) {
+            log.error("PC|消息列表查询失败", e);
+            return ApiResponse.fail("消息列表查询失败: " + e.getMessage());
+        }
+    }
+
+    @GetMapping("/channels")
+    public ApiResponse<ChannelsResponse> listChannels() {
+        log.info("PC|获取消息通道列表");
+        try {
+            ChannelsResponse data = messageService.listChannels();
+            return ApiResponse.success(data);
+        } catch (Exception e) {
+            log.error("PC|获取消息通道列表失败", e);
+            return ApiResponse.fail("获取消息通道列表失败: " + e.getMessage());
+        }
+    }
+}