feat: 实现情绪记录功能和聊天历史查看

- 完成情绪记录生成功能，支持AI分析聊天内容生成情绪记录
- 实现聊天页面历史记录查看，支持分页和搜索
- 修改日记页面展示情绪记录而非普通日记
- 添加情绪记录的增删改查API
- 优化前端UI，添加情绪强度显示和详细信息展示
- 修复SCSS变量缺失问题

backend-single/src/main/java/com/emotion/controller/MessageController.java

@@ -123,6 +123,41 @@ public class MessageController {
         return Result.success(count);
     }
 
+    /**
+     * 根据用户ID分页查询消息
+     */
+    @GetMapping("/user/{userId}/page")
+    public Result<PageResult<MessageResponse>> getPageByUserId(@PathVariable String userId,
+            @Valid PageRequest request) {
+        IPage<Message> page = messageService.getByUserIdWithPage(userId, Math.toIntExact(request.getCurrent()), Math.toIntExact(request.getSize()));
+        List<MessageResponse> responses = page.getRecords().stream()
+                .map(this::convertToResponse)
+                .collect(Collectors.toList());
+
+        PageResult<MessageResponse> pageResult = new PageResult<>();
+        pageResult.setCurrent(page.getCurrent());
+        pageResult.setSize(page.getSize());
+        pageResult.setTotal(page.getTotal());
+        pageResult.setPages(page.getPages());
+        pageResult.setRecords(responses);
+
+        return Result.success(pageResult);
+    }
+
+    /**
+     * 根据用户ID和关键词搜索消息
+     */
+    @GetMapping("/user/{userId}/search")
+    public Result<List<MessageResponse>> searchByUserId(@PathVariable String userId,
+            @RequestParam String keyword,
+            @RequestParam(defaultValue = "50") Integer limit) {
+        List<Message> messages = messageService.searchByUserIdAndKeyword(userId, keyword, limit);
+        List<MessageResponse> responses = messages.stream()
+                .map(this::convertToResponse)
+                .collect(Collectors.toList());
+        return Result.success(responses);
+    }
+
     /**
      * 转换为响应对象
      */