refactor(database): 更新数据库配置和实体映射

- 修改数据库连接URL地址
- 为所有实体类添加@TableField注解映射数据库字段
- 使用反引号标识符包裹表名和字段名
- 更新SQL查询语句使用明确字段列表
- 在配置文件中启用MyBatis安全模式防止SQL注入
- 添加MarkdownFileVO中groupingName字段的exist = false标识

biji-houdaun/src/main/java/com/test/bijihoudaun/entity/MarkdownFile.java

@@ -14,15 +14,20 @@ import java.util.Date;
 
 @Data
 @Schema(name = "文本实体")
-@TableName("markdown_file")
+@TableName("`markdown_file`")
 public class MarkdownFile implements Serializable {
     @Schema(description = "文本id",implementation = Long.class)
     @TableId(type = IdType.AUTO)
     @JsonFormat(shape = JsonFormat.Shape.STRING) // 仅作用于此字段
+    @TableField("id")
     private Long id;
+    
     @Schema(description = "分组表id",implementation = Long.class)
+    @TableField("grouping_id")
     private Long groupingId;
+    
     @Schema(description = "文本标题",implementation = String.class)
+    @TableField("`title`")
     private String title;
 
     @Schema(description = " 文件名（带.md后缀），用于存储和识别",implementation = String.class)
@@ -30,22 +35,31 @@ public class MarkdownFile implements Serializable {
     private String fileName;
 
     @Schema(description = "Markdown内容，存储实际文档内容",implementation = String.class)
+    @TableField("`content`")
     private String content;
+    
     @Schema(description = "创建时间",implementation = Date.class)
+    @TableField("created_at")
     private Date createdAt;
+    
     @Schema(description = "更新时间",implementation = Date.class)
+    @TableField("updated_at")
     private Date updatedAt;
 
     @Schema(description = "是否删除 0-未删除 1-已删除", implementation = Integer.class)
     @TableLogic
+    @TableField("is_deleted")
     private Integer isDeleted;
 
     @Schema(description = "删除时间", implementation = Date.class)
+    @TableField("deleted_at")
     private Date deletedAt;
 
     @Schema(description = "删除人ID", implementation = Long.class)
+    @TableField("deleted_by")
     private Long deletedBy;
 
     @Schema(description = "是否私密 0-公开 1-私密", implementation = Integer.class)
+    @TableField("is_private")
     private Integer isPrivate;
-}
+}