feat(admin): add comprehensive admin management system

- Add admin handlers and services for users, posts, comments, groups, and dashboard
- Implement role permission management with ability to view and update permissions
- Add database seeding for roles and Casbin permission policies
- Upgrade Casbin from v2 to v3 with GORM adapter for persistent policy storage
- Add admin-specific repository methods with filtering and pagination
- Register new admin API routes under /api/v1/admin/*

internal/wire/service.go

@@ -43,6 +43,11 @@ var ServiceSet = wire.NewSet(
 	ProvideUploadService,
 	ProvideUserActivityService,
 	ProvideRoleService,
+	ProvideAdminUserService,
+	ProvideAdminPostService,
+	ProvideAdminCommentService,
+	ProvideAdminGroupService,
+	ProvideAdminDashboardService,
 )
 
 // ProvideJWTService 提供 JWT 服务
@@ -214,3 +219,38 @@ func ProvideRoleService(
 ) service.RoleService {
 	return service.NewRoleService(roleRepo, casbinSvc)
 }
+
+// ProvideAdminUserService 提供管理端用户服务
+func ProvideAdminUserService(userRepo *repository.UserRepository) service.AdminUserService {
+	return service.NewAdminUserService(userRepo)
+}
+
+// ProvideAdminPostService 提供管理端帖子服务
+func ProvideAdminPostService(postRepo *repository.PostRepository, cacheBackend cache.Cache) service.AdminPostService {
+	return service.NewAdminPostService(postRepo, cacheBackend)
+}
+
+// ProvideAdminCommentService 提供管理端评论服务
+func ProvideAdminCommentService(commentRepo *repository.CommentRepository, postRepo *repository.PostRepository) service.AdminCommentService {
+	return service.NewAdminCommentService(commentRepo, postRepo)
+}
+
+// ProvideAdminGroupService 提供管理端群组服务
+func ProvideAdminGroupService(
+	groupRepo repository.GroupRepository,
+	userRepo *repository.UserRepository,
+) service.AdminGroupService {
+	return service.NewAdminGroupService(groupRepo, userRepo)
+}
+
+// ProvideAdminDashboardService 提供管理端仪表盘服务
+func ProvideAdminDashboardService(
+	db *gorm.DB,
+	userRepo *repository.UserRepository,
+	postRepo *repository.PostRepository,
+	commentRepo *repository.CommentRepository,
+	groupRepo repository.GroupRepository,
+	activityRepo *repository.UserActivityRepository,
+) service.AdminDashboardService {
+	return service.NewAdminDashboardService(db, userRepo, postRepo, commentRepo, groupRepo, activityRepo)
+}