feat: replace quota input with amount-first UI and atomic quota adjustment

- Refactor token, redemption, and user quota inputs to prioritize monetary
  amount entry, with raw quota input collapsed by default
- Add atomic quota adjustment modal for users with add/subtract/override modes,
  bypassing batch update queue for immediate DB consistency
- Make user quota fields readonly in edit form; all modifications go through
  the dedicated adjust-quota modal via POST /api/user/manage
- Add DecreaseUserQuota `db` parameter for direct DB writes, matching
  IncreaseUserQuota behavior
- Support negative quota display in amount conversion helpers
- Add i18n keys for all new UI strings across all locales

controller/user.go

@@ -572,9 +572,6 @@ func UpdateUser(c *gin.Context) {
 		common.ApiError(c, err)
 		return
 	}
-	if originUser.Quota != updatedUser.Quota {
-		model.RecordLog(originUser.Id, model.LogTypeManage, fmt.Sprintf("管理员将用户额度从 %s修改为 %s", logger.LogQuota(originUser.Quota), logger.LogQuota(updatedUser.Quota)))
-	}
 	c.JSON(http.StatusOK, gin.H{
 		"success": true,
 		"message": "",
@@ -841,6 +838,8 @@ func CreateUser(c *gin.Context) {
 type ManageRequest struct {
 	Id     int    `json:"id"`
 	Action string `json:"action"`
+	Value  int    `json:"value"`
+	Mode   string `json:"mode"`
 }
 
 // ManageUser Only admin user can do this
@@ -907,6 +906,47 @@ func ManageUser(c *gin.Context) {
 			return
 		}
 		user.Role = common.RoleCommonUser
+	case "add_quota":
+		switch req.Mode {
+		case "add":
+			if req.Value <= 0 {
+				common.ApiErrorI18n(c, i18n.MsgUserQuotaChangeZero)
+				return
+			}
+			if err := model.IncreaseUserQuota(user.Id, req.Value, true); err != nil {
+				common.ApiError(c, err)
+				return
+			}
+			model.RecordLog(user.Id, model.LogTypeManage,
+				fmt.Sprintf("管理员增加用户额度 %s", logger.LogQuota(req.Value)))
+		case "subtract":
+			if req.Value <= 0 {
+				common.ApiErrorI18n(c, i18n.MsgUserQuotaChangeZero)
+				return
+			}
+			if err := model.DecreaseUserQuota(user.Id, req.Value, true); err != nil {
+				common.ApiError(c, err)
+				return
+			}
+			model.RecordLog(user.Id, model.LogTypeManage,
+				fmt.Sprintf("管理员减少用户额度 %s", logger.LogQuota(req.Value)))
+		case "override":
+			oldQuota := user.Quota
+			if err := model.DB.Model(&model.User{}).Where("id = ?", user.Id).Update("quota", req.Value).Error; err != nil {
+				common.ApiError(c, err)
+				return
+			}
+			model.RecordLog(user.Id, model.LogTypeManage,
+				fmt.Sprintf("管理员覆盖用户额度从 %s 为 %s", logger.LogQuota(oldQuota), logger.LogQuota(req.Value)))
+		default:
+			common.ApiErrorI18n(c, i18n.MsgInvalidParams)
+			return
+		}
+		c.JSON(http.StatusOK, gin.H{
+			"success": true,
+			"message": "",
+		})
+		return
 	}
 
 	if err := user.Update(false); err != nil {