feat(database): 添加 MySQL 数据库支持并迁移数据表结构

- 新增 MySQL 5.7.44 建表脚本，包含分组、图片、Markdown文件等7张表
- 添加 SQLite 转 MySQL 的数据库迁移脚本
- 配置开发环境使用 MySQL 数据源连接
- 更新生产环境配置注释 SQLite 配置并预留 MySQL 配置位置
- 修改前端笔记编辑器保存逻辑，完善笔记更新功能
- 替换 SQLite 驱动为 MySQL 连接器依赖
- 添加 commons-codec 依赖用于 SHA256 计算功能

biji-houdaun/src/main/resources/application-dev.yml

@@ -1,18 +1,31 @@
 spring:
   datasource:
-    driver-class-name: org.sqlite.JDBC
-    url: jdbc:sqlite:C:\it\houtaigunli\biji\mydatabase.db
+#    driver-class-name: org.sqlite.JDBC
+#      url: jdbc:sqlite:C:\it\houtaigunli\biji\mydatabase.db
+#    jpa:
+#      hibernate:
+#        ddl-auto: none
+#      show-sql: true
+#      properties:
+#        hibernate:
+#          format_sql: true
+#          dialect: org.hibernate.dialect.SQLiteDialect
+#
+
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: jdbc:mysql://panel-jp.998521.xyz:37857/biji_db?useSSL=false&serverTimezone=UTC&characterEncoding=utf8
+    username: root
+    password: Ll@12331100
   jpa:
     hibernate:
-      ddl-auto: none
+      ddl-auto: update
     show-sql: true
     properties:
       hibernate:
         format_sql: true
-        dialect: org.hibernate.dialect.SQLiteDialect
+        dialect: org.hibernate.dialect.MySQLDialect
 
-
-# MyBatis-Plus??
+# MyBatis-Plus配置
 mybatis-plus:
   mapper-locations: classpath:mapper/*.xml
   configuration:

biji-houdaun/src/main/resources/application-prod.yml

@@ -1,15 +1,17 @@
 spring:
-  datasource:
-    driver-class-name: org.sqlite.JDBC
-    url: jdbc:sqlite:/data/mydatabase.db
-  jpa:
-    hibernate:
-      ddl-auto: none
-    show-sql: false
-    properties:
-      hibernate:
-        format_sql: false
-        dialect: org.hibernate.dialect.SQLiteDialect
+#  datasource:
+#    driver-class-name: org.sqlite.JDBC
+#    url: jdbc:sqlite:/data/mydatabase.db
+#  jpa:
+#    hibernate:
+#      ddl-auto: none
+#    show-sql: false
+#    properties:
+#      hibernate:
+#        format_sql: false
+#        dialect: org.hibernate.dialect.SQLiteDialect
+
+