feat: enhance player login validation and update betting preview

- Added username and password validation to the player login screen, improving user feedback for input errors.
- Updated the betting preview dialog to conditionally display rebate information based on the applied instant rebate status.
- Enhanced documentation in AGENTS.md to clarify credit flow and settlement processes.
- Modified .env.example to provide clearer instructions for multi-site deployment configurations.

src/features/hall/hall-bet-preview-dialog.tsx

@@ -116,6 +116,10 @@ export function HallBetPreviewDialog({
   const { t } = useTranslation("player");
   const summary = data?.summary;
   const lines = data?.lines ?? [];
+  const periodRebate = summary?.instant_rebate_applied === false;
+  const rebateLabel = periodRebate
+    ? t("hall.preview.periodRebate", { defaultValue: "账期回水" })
+    : t("hall.preview.rebate");
 
   useEffect(() => {
     if (open && !placing && !data) {
@@ -216,7 +220,7 @@ export function HallBetPreviewDialog({
                           {t("hall.preview.amount")}
                         </th>
                         <th className="border-r border-[#dfe8f6] px-2 py-3 text-center font-black">
-                          {t("hall.preview.rebate")}
+                          {rebateLabel}
                         </th>
                         <th className="border-r border-[#dfe8f6] px-2 py-3 text-center font-black">
                           {t("hall.preview.estimatedMax")}
@@ -245,7 +249,8 @@ export function HallBetPreviewDialog({
                             {formatMinorAsCurrency(ln.total_bet_amount, currencyCode)}
                           </td>
                           <td className="border-r border-[#e8eef7] px-2 py-3 text-center font-semibold tabular-nums text-emerald-600">
-                            -{formatMinorAsCurrency(ln.rebate_amount, currencyCode).replace(`${currencyCode} `, "")}
+                            {periodRebate ? "" : "-"}
+                            {formatMinorAsCurrency(ln.rebate_amount, currencyCode).replace(`${currencyCode} `, "")}
                           </td>
                           <td className="border-r border-[#e8eef7] px-2 py-3 text-center font-black tabular-nums text-[#e5002c]">
                             {formatMinorAsCurrency(ln.estimated_max_payout, currencyCode)}
@@ -268,9 +273,9 @@ export function HallBetPreviewDialog({
                       </p>
                     </div>
                     <div className="border-r border-[#dfe8f6] px-2 py-3">
-                      <p className="font-bold text-[#304f86]">{t("hall.preview.rebate")}</p>
+                      <p className="font-bold text-[#304f86]">{rebateLabel}</p>
                       <p className="mt-1 font-black tabular-nums text-emerald-600">
-                        -
+                        {periodRebate ? "" : "-"}
                         {formatMinorAsCurrency(summary.total_rebate_amount, currencyCode).replace(
                           `${currencyCode} `,
                           "",
@@ -292,6 +297,15 @@ export function HallBetPreviewDialog({
                   </div>
                 ) : null}
 
+                {periodRebate ? (
+                  <p className="text-xs leading-relaxed text-slate-500">
+                    {t("hall.preview.periodRebateHint", {
+                      defaultValue:
+                        "信用盘回水在账期结算入账，下注时按全额占用可用信用，此处为账期回水预估。",
+                    })}
+                  </p>
+                ) : null}
+
                 {data.warnings.length > 0 ? (
                   <WarningsBlock warnings={data.warnings} />
                 ) : (