feat(client): 完成 P3 业务页联动闭环（D6/D8/D10/D11）

- 待办：列表/详情 + approve/reject/return/transfer（D6）
- 报销：列表/详情 + create/submit/withdraw/pay（D8）
- 票据：列表/上传/OCR轮询/绑定/预览（D10）
- 统一：Api types + 错误映射 + react-query缓存失效（D11）

client/src/api/invoicePool.ts

@@ -0,0 +1,130 @@
+import { apiRequestData } from "./http";
+
+export type InvoicePoolStatus = "pending_ocr" | "ocr_failed" | "available" | "bound" | "archived";
+
+export type InvoicePoolListItem = {
+  id: string;
+  status: InvoicePoolStatus;
+  ocrType: string;
+  ocrProvider: string;
+  ocrAttempts: number;
+  ocrLastError: string | null;
+  ocrCompletedAt: string | null;
+  invoiceCode: string | null;
+  invoiceNumber: string | null;
+  invoiceDate: string | null;
+  amount: string | null;
+  taxAmount: string | null;
+  totalAmount: string | null;
+  linkedReimbursementId: string | null;
+  linkedItemId: string | null;
+  originalName: string;
+  mimeType: string;
+  fileSize: number;
+  owner: {
+    id: string;
+    employeeNo: string;
+    name: string;
+  } | null;
+  uploadedBy: {
+    id: string;
+    employeeNo: string;
+    name: string;
+  } | null;
+  createdAt: string | null;
+  updatedAt: string | null;
+};
+
+export type InvoicePoolListResponse = {
+  page: number;
+  pageSize: number;
+  total: number;
+  ownerScope: "own" | "all";
+  items: InvoicePoolListItem[];
+};
+
+export type InvoicePoolDetail = {
+  id: string;
+  status: InvoicePoolStatus;
+  ownerEmployeeId: string;
+  uploadedByEmployeeId: string;
+  ocrType: string;
+  ocrProvider: string;
+  ocrAttempts: number;
+  ocrLastError: string | null;
+  ocrCompletedAt: string | null;
+  invoiceCode: string | null;
+  invoiceNumber: string | null;
+  invoiceDate: string | null;
+  amount: string | null;
+  taxAmount: string | null;
+  totalAmount: string | null;
+  linkedReimbursementId: string | null;
+  linkedItemId: string | null;
+  createdAt: string | null;
+  updatedAt: string | null;
+};
+
+export type InvoicePoolListQuery = {
+  page?: number;
+  pageSize?: number;
+  status?: InvoicePoolStatus;
+  ownerScope?: "own" | "all";
+};
+
+function toQueryString(query: Record<string, string | number | undefined>) {
+  const params = new URLSearchParams();
+
+  for (const [key, value] of Object.entries(query)) {
+    if (value == null || value === "") {
+      continue;
+    }
+    params.set(key, String(value));
+  }
+
+  const encoded = params.toString();
+  return encoded ? `?${encoded}` : "";
+}
+
+export async function fetchInvoicePoolList(query: InvoicePoolListQuery = {}) {
+  return apiRequestData<InvoicePoolListResponse>(
+    `/api/invoice-pool${toQueryString(query as Record<string, string | number | undefined>)}`,
+  );
+}
+
+export async function fetchInvoicePoolDetail(invoiceId: string) {
+  return apiRequestData<InvoicePoolDetail>(`/api/invoice-pool/${invoiceId}`);
+}
+
+export async function uploadInvoice(file: File, ocrType?: string) {
+  const formData = new FormData();
+  formData.append("file", file);
+  if (ocrType) {
+    formData.append("ocr_type", ocrType);
+  }
+
+  return apiRequestData<{ invoicePoolId: string; status: string; fileSha256: string }>(
+    "/api/invoice-pool/upload",
+    {
+      method: "POST",
+      body: formData,
+    },
+  );
+}
+
+export async function bindInvoice(invoiceId: string, reimbursementId: string, linkedItemId?: string) {
+  return apiRequestData<Record<string, unknown>>(`/api/invoice-pool/${invoiceId}/bind`, {
+    method: "POST",
+    body: JSON.stringify({ reimbursementId, linkedItemId }),
+  });
+}
+
+export async function fetchInvoiceSignedUrl(invoiceId: string) {
+  return apiRequestData<{ signedUrl: string; expiresAt: string }>(
+    `/api/invoice-pool/${invoiceId}/signed-url`,
+    {
+      method: "POST",
+      body: JSON.stringify({}),
+    },
+  );
+}