feat(client): 报销明细编辑器与费用类型下拉(F6)

- 报销详情新增明细列表与新增/编辑/删除入口
- 接入费用类型只读接口并保持总金额自动刷新
- 补 data-testid 以便 E2E/回归

client/src/api/reimbursements.ts

@@ -8,6 +8,21 @@ export type ReimbursementStatus =
   | "rejected"
   | "cancelled";
 
+export type ReimbursementItem = {
+  id: string;
+  expenseTypeId: string;
+  expenseDate: string | null;
+  amount: string;
+  description: string | null;
+  expenseType: {
+    id: string;
+    code: string;
+    name: string;
+    category: string;
+    enabled: boolean;
+  } | null;
+};
+
 export type ReimbursementListItem = {
   id: string;
   formNumber: string | null;
@@ -81,6 +96,7 @@ export type ReimbursementDetail = {
       assignee_role: string | null;
     } | null;
   } | null;
+  items: ReimbursementItem[];
 };
 
 export type ReimbursementListQuery = {
@@ -96,6 +112,29 @@ export type ReimbursementPayPayload = {
   paymentChannel?: "bank" | "alipay" | "wechat" | "cash" | "other";
 };
 
+export type ReimbursementItemPayload = {
+  expenseTypeId: string;
+  expenseDate: string;
+  amount: string;
+  description?: string;
+};
+
+export type ReimbursementItemMutationResponse = {
+  item: {
+    id: string;
+    expenseTypeId: string;
+    expenseDate: string;
+    amount: string;
+    description: string | null;
+  };
+  totalAmount: string;
+};
+
+export type ReimbursementItemDeleteResponse = {
+  outcome: "deleted";
+  totalAmount: string;
+};
+
 function toQueryString(query: Record<string, string | number | undefined>) {
   const params = new URLSearchParams();
 
@@ -150,3 +189,39 @@ export async function payReimbursement(reimbursementId: string, payload: Reimbur
     body: JSON.stringify(payload),
   });
 }
+
+export async function createReimbursementItem(
+  reimbursementId: string,
+  payload: ReimbursementItemPayload,
+) {
+  return apiRequestData<ReimbursementItemMutationResponse>(
+    `/api/reimbursements/${reimbursementId}/items`,
+    {
+      method: "POST",
+      body: JSON.stringify(payload),
+    },
+  );
+}
+
+export async function updateReimbursementItem(
+  reimbursementId: string,
+  itemId: string,
+  payload: Partial<ReimbursementItemPayload>,
+) {
+  return apiRequestData<ReimbursementItemMutationResponse>(
+    `/api/reimbursements/${reimbursementId}/items/${itemId}`,
+    {
+      method: "PATCH",
+      body: JSON.stringify(payload),
+    },
+  );
+}
+
+export async function deleteReimbursementItem(reimbursementId: string, itemId: string) {
+  return apiRequestData<ReimbursementItemDeleteResponse>(
+    `/api/reimbursements/${reimbursementId}/items/${itemId}`,
+    {
+      method: "DELETE",
+    },
+  );
+}