feat(permission): 创建权限管理核心模块

- V21迁移: 创建10张权限系统表（sys_role, sys_permission等）
- 添加角色实体(SysRole)、Repository、Service
- 添加权限系统Schema验证测试(21个测试用例)

Phase 1数据库表创建完成，Phase 2开始实施

src/test/java/com/mosquito/project/permission/PermissionSchemaVerificationTest.java

@@ -270,7 +270,7 @@ class PermissionSchemaVerificationTest {
 
 @Entity
 @Table(name = "sys_role")
-class SysRole {
+public class SysRole {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -305,7 +305,7 @@ class SysRole {
 
 @Entity
 @Table(name = "sys_permission")
-class SysPermission {
+public class SysPermission {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -340,7 +340,7 @@ class SysPermission {
 
 @Entity
 @Table(name = "sys_user_role")
-class SysUserRole {
+public class SysUserRole {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -363,7 +363,7 @@ class SysUserRole {
 
 @Entity
 @Table(name = "sys_role_permission")
-class SysRolePermission {
+public class SysRolePermission {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -380,7 +380,7 @@ class SysRolePermission {
 
 @Entity
 @Table(name = "sys_department")
-class SysDepartment {
+public class SysDepartment {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -409,7 +409,7 @@ class SysDepartment {
 
 @Entity
 @Table(name = "sys_approval_flow")
-class SysApprovalFlow {
+public class SysApprovalFlow {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -444,7 +444,7 @@ class SysApprovalFlow {
 
 @Entity
 @Table(name = "sys_approval_record")
-class SysApprovalRecord {
+public class SysApprovalRecord {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -479,7 +479,7 @@ class SysApprovalRecord {
 
 @Entity
 @Table(name = "sys_approval_history")
-class SysApprovalHistory {
+public class SysApprovalHistory {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -505,7 +505,7 @@ class SysApprovalHistory {
 
 @Entity
 @Table(name = "sys_permission_audit")
-class SysPermissionAudit {
+public class SysPermissionAudit {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
@@ -537,7 +537,7 @@ class SysPermissionAudit {
 
 @Entity
 @Table(name = "sys_sensitive_field")
-class SysSensitiveField {
+public class SysSensitiveField {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;