feat: 管理首页帖子总数统计（总数/已发布/待审核）

- PostRepo 新增 CountPostsByStatus 和 CountPending 方法
- Service 层定义 postAdminStatStore 接口 (ISP)
- AdminService 注入 postRepo，新增 PostStats 结构体和 GetPostStats 方法
- AdminController.Dashboard 调用 GetPostStats 并传参到模板
- Dashboard 帖子卡片显示总数 + 已发布 + 待审核（橙色徽章）
- DI 层将 AdminController 创建从 buildDepsCore 移至 buildDeps，以便注入 postRepo

internal/controller/admin/admin_controller.go

@@ -29,10 +29,17 @@ func (ac *AdminController) Dashboard(c *gin.Context) {
 	if err != nil {
 		totalUsers = 0
 	}
+	postStats, err := ac.adminService.GetPostStats()
+	if err != nil {
+		postStats = &service.PostStats{}
+	}
 	storeMetrics := ac.adminService.GetStoreMetrics()
 	c.HTML(http.StatusOK, "admin/dashboard/index.html", common.BuildAdminPageData(c, gin.H{
 		"Title":          "管理首页",
 		"TotalUsers":     totalUsers,
+		"PostTotal":      postStats.Total,
+		"PostApproved":   postStats.Approved,
+		"PostPending":    postStats.Pending,
 		"StoreType":      storeMetrics.Type,
 		"StoreHealthy":   storeMetrics.Healthy,
 		"StoreDegraded":  storeMetrics.Degraded,

internal/controller/admin/interfaces.go

@@ -6,12 +6,13 @@ import (
 	"metazone.cc/metalab/internal/session"
 )
 
-// adminUseCase AdminController 对 AdminService 的最小依赖（ISP：5 个方法）
+// adminUseCase AdminController 对 AdminService 的最小依赖（ISP：6 个方法）
 type adminUseCase interface {
 	ListUsers(params service.ListUsersParams) (*service.ListUsersResult, error)
 	UpdateUserStatus(operatorUID, targetUID uint, newStatus string) error
 	ResetUserToken(operatorUID, targetUID uint) error
 	CountUsers() (int64, error)
+	GetPostStats() (*service.PostStats, error)
 	GetStoreMetrics() session.StoreMetrics
 }
 

internal/repository/post_repo.go

@@ -137,6 +137,24 @@ func (r *PostRepo) SoftDelete(id uint) error {
 	return r.db.Delete(&model.Post{}, id).Error
 }
 
+// CountPostsByStatus 统计帖子数量（status 为空则统计全部未删除帖子）
+func (r *PostRepo) CountPostsByStatus(status string) (int64, error) {
+	query := r.buildQuery("", status)
+	var total int64
+	err := query.Count(&total).Error
+	return total, err
+}
+
+// CountPending 统计待审核帖子数（pending 状态 + approved 但有待审修订）
+func (r *PostRepo) CountPending() (int64, error) {
+	var total int64
+	err := r.db.Table("posts").
+		Where("deleted_at IS NULL").
+		Where("status = ? OR (status = ? AND pending_body != '')", model.PostStatusPending, model.PostStatusApproved).
+		Count(&total).Error
+	return total, err
+}
+
 // Restore 恢复软删除
 func (r *PostRepo) Restore(id uint) error {
 	result := r.db.Unscoped().Model(&model.Post{}).Where("id = ?", id).Update("deleted_at", nil)

internal/router/deps_core.go

@@ -34,7 +34,7 @@ type dependencies struct {
 func buildDepsCore(db *gorm.DB, cfg *config.Config, siteSettings *config.SiteSettings, redisClient *redis.Client) (
 	*repository.UserRepo, *session.Manager, *service.AuthService,
 	*middleware.RateLimiter, *controller.AuthController,
-	*service.AvatarService, *middleware.AuthMiddleware, *adminCtrl.AdminController,
+	*service.AvatarService, *middleware.AuthMiddleware,
 ) {
 	userRepo := repository.NewUserRepo(db)
 
@@ -65,6 +65,5 @@ func buildDepsCore(db *gorm.DB, cfg *config.Config, siteSettings *config.SiteSet
 	authCtrl := controller.NewAuthController(authService, sessionMgr, rateLimiter, cfg)
 	avatarSvc := service.NewAvatarService(userRepo)
 	authMdw := middleware.NewAuthMiddleware(cfg, sessionMgr)
-	adminController := adminCtrl.NewAdminController(service.NewAdminService(userRepo, sessionMgr))
-	return userRepo, sessionMgr, authService, rateLimiter, authCtrl, avatarSvc, authMdw, adminController
+	return userRepo, sessionMgr, authService, rateLimiter, authCtrl, avatarSvc, authMdw
 }

internal/router/deps_extra.go

@@ -13,7 +13,7 @@ import (
 )
 
 func buildDeps(db *gorm.DB, cfg *config.Config, siteSettings *config.SiteSettings, redisClient *redis.Client) *dependencies {
-	userRepo, sessionMgr, authService, _, authCtrl, avatarSvc, authMdw, adminController := buildDepsCore(db, cfg, siteSettings, redisClient)
+	userRepo, sessionMgr, authService, _, authCtrl, avatarSvc, authMdw := buildDepsCore(db, cfg, siteSettings, redisClient)
 
 	auditRepo := repository.NewAuditRepo(db)
 	notificationRepo := repository.NewNotificationRepo(db)
@@ -37,6 +37,7 @@ func buildDeps(db *gorm.DB, cfg *config.Config, siteSettings *config.SiteSetting
 	shortcodeSvc := service.NewShortcodeService()
 	postCtrl := controller.NewPostController(postService, shortcodeSvc)
 	adminPostCtrl := adminCtrl.NewAdminPostController(postService)
+	adminController := adminCtrl.NewAdminController(service.NewAdminService(userRepo, postRepo, sessionMgr))
 	studioCtrl := controller.NewStudioController(postService)
 
 	// 用户空间

internal/service/admin_service.go

@@ -8,12 +8,20 @@ import (
 
 type AdminService struct {
 	userRepo       userAdminStore
+	postRepo       postAdminStatStore
 	sessionManager *session.Manager
 }
 
+// PostStats 帖子统计结果（管理首页用）
+type PostStats struct {
+	Total    int64 // 全部未删除帖子数
+	Approved int64 // 已发布数
+	Pending  int64 // 待审核数（pending + 待审修订）
+}
+
 // NewAdminService 构造函数
-func NewAdminService(userRepo userAdminStore, sm *session.Manager) *AdminService {
-	return &AdminService{userRepo: userRepo, sessionManager: sm}
+func NewAdminService(userRepo userAdminStore, postRepo postAdminStatStore, sm *session.Manager) *AdminService {
+	return &AdminService{userRepo: userRepo, postRepo: postRepo, sessionManager: sm}
 }
 
 // ListUsersParams 用户列表查询参数
@@ -112,6 +120,23 @@ func (s *AdminService) CountUsers() (int64, error) {
 	return s.userRepo.CountSearchUsers("", "", "")
 }
 
+// GetPostStats 获取帖子统计（管理首页用）
+func (s *AdminService) GetPostStats() (*PostStats, error) {
+	total, err := s.postRepo.CountPostsByStatus("")
+	if err != nil {
+		return nil, err
+	}
+	approved, err := s.postRepo.CountPostsByStatus(model.PostStatusApproved)
+	if err != nil {
+		return nil, err
+	}
+	pending, err := s.postRepo.CountPending()
+	if err != nil {
+		return nil, err
+	}
+	return &PostStats{Total: total, Approved: approved, Pending: pending}, nil
+}
+
 // GetStoreMetrics 返回会话存储状态信息（管理首页用）
 func (s *AdminService) GetStoreMetrics() session.StoreMetrics {
 	return s.sessionManager.GetStoreMetrics()

internal/service/repository.go

@@ -47,6 +47,12 @@ type spacePostStore interface {
 	FindByUserID(userID uint, offset, limit int) ([]model.Post, int64, error)
 }
 
+// postAdminStatStore AdminService 所需的帖子统计接口（ISP：2 个方法）
+type postAdminStatStore interface {
+	CountPostsByStatus(status string) (int64, error)
+	CountPending() (int64, error)
+}
+
 // postNotifier PostService 所需的通知服务接口
 type postNotifier interface {
 	NotifyPostApproved(userID uint, postTitle string, postID uint)