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/user.go

@@ -165,6 +165,21 @@ func (h *Handlers) UserComments(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 && middleware.CurrentUser(c) == nil {
+		page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+		size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))
+		c.JSON(http.StatusOK, gin.H{
+			"comments":      []any{},
+			"total":         0,
+			"page":          page,
+			"size":          size,
+			"require_login": true,
+		})
+		return
+	}
 
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
 	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))