feattrash: 优化删除功能和回收站逻辑

- 修改 Markdown 文件和分组的删除逻辑，使用软删除方式
- 更新回收站相关接口和页面展示
-优化前端保存逻辑，支持新建文件和更新文件
- 调整后端 API 接口，使用更合适的 HTTP 方法

biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/GroupingMapper.java

@@ -3,7 +3,13 @@ package com.test.bijihoudaun.mapper;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.test.bijihoudaun.entity.Grouping;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
 
 @Mapper
 public interface GroupingMapper extends BaseMapper<Grouping> {
+
+    @Select("SELECT * FROM grouping WHERE is_deleted = 1")
+    List<Grouping> selectDeleted();
 }

biji-houdaun/src/main/java/com/test/bijihoudaun/mapper/MarkdownFileMapper.java

@@ -15,6 +15,7 @@ public interface MarkdownFileMapper extends BaseMapper<MarkdownFile> {
     @Select("SELECT mf.*, g.grouping as groupingName " +
             "FROM markdown_file mf " +
             "LEFT JOIN grouping g ON mf.grouping_id = g.id " +
+            "WHERE mf.is_deleted = 0 " +
             "ORDER BY mf.updated_at DESC " +
             "LIMIT #{limit}")
     List<MarkdownFileVO> selectRecentWithGrouping(@Param("limit") int limit);
@@ -22,7 +23,10 @@ public interface MarkdownFileMapper extends BaseMapper<MarkdownFile> {
     @Select("SELECT mf.*, g.grouping as groupingName " +
             "FROM markdown_file mf " +
             "LEFT JOIN grouping g ON mf.grouping_id = g.id " +
-            "WHERE mf.grouping_id = #{groupingId} " +
+            "WHERE mf.grouping_id = #{groupingId} AND mf.is_deleted = 0 " +
             "ORDER BY mf.updated_at DESC")
     List<MarkdownFileVO> selectByGroupingIdWithGrouping(@Param("groupingId") String groupingId);
+
+    @Select("SELECT * FROM markdown_file WHERE is_deleted = 1")
+    List<MarkdownFile> selectDeleted();
 }