feat(comments): 软删占位、理由与恢复，管理删仅对访客打码

自删/管理删差异文案与理由可见性，评论者与管理员免马赛克，并支持恢复与处理人链接。

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

backend/handler/moderation.go

@@ -157,7 +157,26 @@ func (h *Handlers) AdminPurgePost(c *gin.Context) {
 }
 
 func (h *Handlers) AdminSoftDeleteComment(c *gin.Context) {
-	h.execContentAction(c, h.Moderation.SoftDeleteComment)
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil || id == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的 ID"})
+		return
+	}
+	var body struct {
+		DeleteType   string `json:"delete_type"`
+		DeleteReason string `json:"delete_reason"`
+	}
+	if err := c.ShouldBindJSON(&body); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请提交删除类型与理由"})
+		return
+	}
+	actor := middleware.CurrentActor(c)
+	if err := h.Moderation.SoftDeleteComment(actor, uint(id), body.DeleteType, body.DeleteReason); err != nil {
+		h.writeModerationError(c, err)
+		return
+	}
+	h.broadcastModerationChanged()
+	c.JSON(http.StatusOK, gin.H{"message": "操作成功"})
 }
 
 func (h *Handlers) AdminRestoreComment(c *gin.Context) {