完善角色与消息权限：收紧板管内容处置，彻底删除仅站长，并统一管理删帖/评弹窗。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/handler/telemetry.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 
 	"github.com/freefire/jiang13-bbs/middleware"
+	"github.com/freefire/jiang13-bbs/model"
 	"github.com/freefire/jiang13-bbs/service"
 	"github.com/gin-gonic/gin"
 )
@@ -47,7 +48,13 @@ func (h *Handlers) TelemetryPageView(c *gin.Context) {
 // GET /api/admin/analytics/overview?range=7d|30d
 func (h *Handlers) AdminAnalyticsOverview(c *gin.Context) {
 	rangeQ := c.DefaultQuery("range", "7d")
-	data, err := h.Analytics.Overview(rangeQ)
+	actor := middleware.CurrentActor(c)
+	scoped := actor != nil && actor.Role == model.RoleBoardAdmin
+	var boardIDs []uint
+	if scoped {
+		boardIDs = actor.BoardIDs
+	}
+	data, err := h.Analytics.Overview(rangeQ, boardIDs, scoped)
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取分析数据失败"})
 		return