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)
 }