完善站点运营设置：分路由管理、登录可见评论、邮件模板内联与关闭注册 SSR。

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

backend/handler/comment.go

@@ -50,6 +50,20 @@ func (h *Handlers) PostComments(c *gin.Context) {
 		})
 		return
 	}
+	if requireLogin, err := h.Setting.CommentsRequireLogin(); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "评论暂时不可用"})
+		return
+	} else if requireLogin && viewerID == 0 {
+		c.JSON(http.StatusOK, gin.H{
+			"comments":       []any{},
+			"total":          0,
+			"total_comments": 0,
+			"page":           page,
+			"size":           size,
+			"require_login":  true,
+		})
+		return
+	}
 
 	boardID, _ := h.Post.GetBoardID(uint(id))