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

service/funding_source.go

@@ -37,7 +37,7 @@ func (w *WalletFunding) PreConsume(amount int) error {
 	if amount <= 0 {
 		return nil
 	}
-	if err := model.DecreaseUserQuota(w.userId, amount); err != nil {
+	if err := model.DecreaseUserQuota(w.userId, amount, false); err != nil {
 		return err
 	}
 	w.consumed = amount
@@ -49,7 +49,7 @@ func (w *WalletFunding) Settle(delta int) error {
 		return nil
 	}
 	if delta > 0 {
-		return model.DecreaseUserQuota(w.userId, delta)
+		return model.DecreaseUserQuota(w.userId, delta, false)
 	}
 	return model.IncreaseUserQuota(w.userId, -delta, false)
 }

service/quota.go

@@ -381,7 +381,7 @@ func PostConsumeQuota(relayInfo *relaycommon.RelayInfo, quota int, preConsumedQu
 	} else {
 		// Wallet
 		if quota > 0 {
-			err = model.DecreaseUserQuota(relayInfo.UserId, quota)
+			err = model.DecreaseUserQuota(relayInfo.UserId, quota, false)
 		} else {
 			err = model.IncreaseUserQuota(relayInfo.UserId, -quota, false)
 		}

service/task_billing.go

@@ -90,7 +90,7 @@ func taskAdjustFunding(task *model.Task, delta int) error {
 		return model.PostConsumeUserSubscriptionDelta(task.PrivateData.SubscriptionId, int64(delta))
 	}
 	if delta > 0 {
-		return model.DecreaseUserQuota(task.UserId, delta)
+		return model.DecreaseUserQuota(task.UserId, delta, false)
 	}
 	return model.IncreaseUserQuota(task.UserId, -delta, false)
 }