feat: 就地通过评审，并为已过审用户提供默认可关的免审发布

帖/评管理入口可直接通过；站点默认信任已有 published 内容的用户后续直发。

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

backend/service/moderation.go

@@ -280,6 +280,26 @@ func (s *ModerationService) RejectComment(actor *Actor, id uint) error {
 	})
 }
 
+// UserHasApprovedContent 用户是否已有至少一篇已发布帖子或一条已发布评论（即曾通过审核或免审直发）
+func (s *ModerationService) UserHasApprovedContent(userID uint) (bool, error) {
+	var n int64
+	if err := s.db.Model(&model.Post{}).
+		Where("user_id = ? AND status = ?", userID, model.ContentStatusPublished).
+		Limit(1).Count(&n).Error; err != nil {
+		return false, err
+	}
+	if n > 0 {
+		return true, nil
+	}
+	n = 0
+	if err := s.db.Model(&model.Comment{}).
+		Where("user_id = ? AND status = ?", userID, model.ContentStatusPublished).
+		Limit(1).Count(&n).Error; err != nil {
+		return false, err
+	}
+	return n > 0, nil
+}
+
 func keys(m map[uint]bool) []uint {
 	out := make([]uint, 0, len(m))
 	for k := range m {

backend/service/setting.go

@@ -13,6 +13,8 @@ import (
 const (
 	// SettingKeyAccent 站点主题色（浅色基准，#rrggbb）；为空表示使用内置默认色
 	SettingKeyAccent = "theme_accent"
+	// SettingKeyTrustReviewedPublish 已过审用户后续发帖/评论免审；缺行视为开启（默认开）
+	SettingKeyTrustReviewedPublish = "trust_reviewed_publish"
 )
 
 // ErrInvalidAccent 主题色格式非法
@@ -55,3 +57,33 @@ func (s *SettingService) SetAccent(hex string) error {
 	st := model.SiteSetting{Key: SettingKeyAccent, Value: hex}
 	return s.db.Save(&st).Error
 }
+
+// TrustReviewedPublish 是否对「已有过审内容」的用户免审。
+// KV 缺行 / 空值视为开启（默认开）；仅显式写入 false/0/off/no 为关闭。
+// 不用 GORM bool default:true，避免零值省略陷阱。
+func (s *SettingService) TrustReviewedPublish() (bool, error) {
+	var st model.SiteSetting
+	err := s.db.Where("key = ?", SettingKeyTrustReviewedPublish).First(&st).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return true, nil
+	}
+	if err != nil {
+		return true, err
+	}
+	v := strings.TrimSpace(strings.ToLower(st.Value))
+	switch v {
+	case "false", "0", "off", "no":
+		return false, nil
+	default:
+		return true, nil
+	}
+}
+
+// SetTrustReviewedPublish 持久化免审开关；开启时删除键以保持「缺行=默认开」语义
+func (s *SettingService) SetTrustReviewedPublish(on bool) error {
+	if on {
+		return s.db.Where("key = ?", SettingKeyTrustReviewedPublish).Delete(&model.SiteSetting{}).Error
+	}
+	st := model.SiteSetting{Key: SettingKeyTrustReviewedPublish, Value: "false"}
+	return s.db.Save(&st).Error
+}