feat: 新增通知系统，支持通知列表、未读计数、标记已读、删除、创建和广播功能，并引入管理员中间件和用户仓库。

internal/handler/notification_handler.go

@@ -205,6 +205,34 @@ func (h *NotificationHandler) CreateNotification(c *gin.Context) {
 	api.Created(c, notification)
 }
 
+// BroadcastNotification handles POST /api/v1/notifications/broadcast
+// Sends a notification to all active users
+func (h *NotificationHandler) BroadcastNotification(c *gin.Context) {
+	// TODO: Add strict admin authorization check
+
+	var input service.BroadcastNotificationInput
+	if err := c.ShouldBindJSON(&input); err != nil {
+		api.BadRequest(c, "Invalid request body: "+err.Error())
+		return
+	}
+
+	// Validate input
+	if input.Title == "" || input.Content == "" {
+		api.BadRequest(c, "Title and content are required")
+		return
+	}
+	if input.Type == "" {
+		input.Type = models.NotificationTypeSystem
+	}
+
+	if err := h.notificationService.BroadcastNotification(input); err != nil {
+		api.InternalError(c, "Failed to broadcast notification: "+err.Error())
+		return
+	}
+
+	api.Success(c, gin.H{"message": "Notification broadcast started"})
+}
+
 // RegisterUserRoutes registers notification routes for regular users
 func (h *NotificationHandler) RegisterUserRoutes(rg *gin.RouterGroup) {
 	notifications := rg.Group("/notifications")
@@ -222,5 +250,6 @@ func (h *NotificationHandler) RegisterAdminRoutes(rg *gin.RouterGroup) {
 	notifications := rg.Group("/notifications")
 	{
 		notifications.POST("", h.CreateNotification)
+		notifications.POST("/broadcast", h.BroadcastNotification)
 	}
 }