feat(qianduan): 重构前端结构并添加新功能

- 新增分类创建功能
- 新增笔记创建功能
- 优化笔记列表展示
- 改进笔记预览界面
- 添加删除笔记功能
- 重构菜单选择逻辑
- 优化文件上传处理
- 更新Markdown编辑器配置

biji-houdaun/src/main/java/com/test/bijihoudaun/controller/GroupingController.java

@@ -1,11 +1,11 @@
 package com.test.bijihoudaun.controller;
 
+import com.test.bijihoudaun.common.response.R;
 import com.test.bijihoudaun.entity.Grouping;
 import com.test.bijihoudaun.service.GroupingService;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
@@ -20,32 +20,32 @@ public class GroupingController {
 
     @Operation(summary = "创建分组")
     @PostMapping
-    public ResponseEntity<Grouping> createGrouping(@RequestBody Grouping grouping) {
+    public R<Grouping> createGrouping(@RequestBody Grouping grouping) {
         Grouping created = groupingService.createGrouping(grouping);
-        return ResponseEntity.ok(created);
+        return R.success(created);
     }
 
     @Operation(summary = "获取全部分组")
     @GetMapping
-    public ResponseEntity<List<Grouping>> getAllGroupings() {
+    public R<List<Grouping>> getAllGroupings() {
         List<Grouping> groupings = groupingService.getAllGroupings();
-        return ResponseEntity.ok(groupings);
+        return R.success(groupings);
     }
 
     @Operation(summary = "更新分组名称")
     @PutMapping("/{id}")
-    public ResponseEntity<Grouping> updateGrouping(
+    public R<Grouping> updateGrouping(
             @PathVariable Long id, 
             @RequestBody Grouping grouping) {
         grouping.setId(id);
         Grouping updated = groupingService.updateGrouping(grouping);
-        return ResponseEntity.ok(updated);
+        return R.success(updated);
     }
 
     @Operation(summary = "删除分组")
     @DeleteMapping("/{id}")
-    public ResponseEntity<Void> deleteGrouping(@PathVariable Long id) {
+    public R<Void> deleteGrouping(@PathVariable Long id) {
         groupingService.deleteGrouping(id);
-        return ResponseEntity.noContent().build();
+        return R.success();
     }
 }