feat: 实现通知管理功能，包括模型、仓库、服务和API处理器。

internal/handler/notification_handler.go

@@ -233,6 +233,24 @@ func (h *NotificationHandler) BroadcastNotification(c *gin.Context) {
 	api.Success(c, gin.H{"message": "Notification broadcast started"})
 }
 
+// GetBroadcastHistory handles GET /api/v1/notifications/announcements
+// Returns a list of system broadcast history
+func (h *NotificationHandler) GetBroadcastHistory(c *gin.Context) {
+	limitStr := c.DefaultQuery("limit", "10")
+	offsetStr := c.DefaultQuery("offset", "0")
+
+	limit, _ := strconv.Atoi(limitStr)
+	offset, _ := strconv.Atoi(offsetStr)
+
+	result, err := h.notificationService.ListAnnouncements(limit, offset)
+	if err != nil {
+		api.InternalError(c, "Failed to get broadcast history: "+err.Error())
+		return
+	}
+
+	api.Success(c, result)
+}
+
 // RegisterUserRoutes registers notification routes for regular users
 func (h *NotificationHandler) RegisterUserRoutes(rg *gin.RouterGroup) {
 	notifications := rg.Group("/notifications")
@@ -251,5 +269,6 @@ func (h *NotificationHandler) RegisterAdminRoutes(rg *gin.RouterGroup) {
 	{
 		notifications.POST("", h.CreateNotification)
 		notifications.POST("/broadcast", h.BroadcastNotification)
+		notifications.GET("/announcements", h.GetBroadcastHistory)
 	}
 }