fix(funds): 结算幂等键复用与转账冲正按钮对齐 API

- 账单收付/补差幂等键在首次操作时生成并复用至成功
- 冲正按钮仅当 API 返回 can_reverse=true 时展示

src/modules/settlement/agent-bill-detail.tsx

@@ -67,8 +67,23 @@ export function AgentBillDetail({
   const [advancedOpen, setAdvancedOpen] = useState(false);
   const confirmRef = useRef<HTMLDivElement>(null);
   const paymentRef = useRef<HTMLDivElement>(null);
+  const paymentIdempotencyKeyRef = useRef<string | null>(null);
+  const adjustmentIdempotencyKeyRef = useRef<string | null>(null);
   const { request: requestConfirm, ConfirmDialog, busy: confirmBusy } = useConfirmAction();
 
+  const createIdempotencyKey = useCallback((prefix: string): string => {
+    const random =
+      typeof crypto !== "undefined" && typeof crypto.randomUUID === "function"
+        ? crypto.randomUUID()
+        : Math.random().toString(36).slice(2, 10);
+    return `${prefix}-${billId}-${Date.now()}-${random}`;
+  }, [billId]);
+
+  useEffect(() => {
+    paymentIdempotencyKeyRef.current = null;
+    adjustmentIdempotencyKeyRef.current = null;
+  }, [billId]);
+
   const load = useCallback(async () => {
     setLoading(true);
     setLoadErr(null);
@@ -202,7 +217,10 @@ export function AgentBillDetail({
       return;
     }
 
-    const idempotencyKey = `pay-${billId}-${Date.now()}-${Math.random().toString(36).slice(2, 10)}`;
+    if (!paymentIdempotencyKeyRef.current) {
+      paymentIdempotencyKeyRef.current = createIdempotencyKey("pay");
+    }
+    const idempotencyKey = paymentIdempotencyKeyRef.current;
     requestConfirm({
       title: t("settlementBills.paymentConfirmTitle", { defaultValue: "确认登记收付？" }),
       description: t("settlementBills.paymentConfirmDescription", {
@@ -218,6 +236,7 @@ export function AgentBillDetail({
             proof: payProof.trim() || undefined,
             idempotency_key: idempotencyKey,
           });
+          paymentIdempotencyKeyRef.current = null;
           await load();
           await onUpdated?.();
           toast.success(t("settlementBills.paid", { defaultValue: "已登记收付" }));
@@ -273,7 +292,10 @@ export function AgentBillDetail({
       return;
     }
 
-    const idempotencyKey = `adj-${billId}-${Date.now()}-${Math.random().toString(36).slice(2, 10)}`;
+    if (!adjustmentIdempotencyKeyRef.current) {
+      adjustmentIdempotencyKeyRef.current = createIdempotencyKey("adj");
+    }
+    const idempotencyKey = adjustmentIdempotencyKeyRef.current;
     requestConfirm({
       title: t("settlementBills.adjustmentConfirmTitle", { defaultValue: "确认创建补差/冲正单？" }),
       description: t("settlementBills.adjustmentConfirmDescription", {
@@ -289,6 +311,7 @@ export function AgentBillDetail({
             reason,
             idempotency_key: idempotencyKey,
           });
+          adjustmentIdempotencyKeyRef.current = null;
           setAdjustAmount("");
           setAdjustReason("");
           toast.success(t("settlementBills.adjustmentCreated", { defaultValue: "已创建补差单" }));