feat(web): add reimbursements service and ConfirmDialog component

- services/reimbursements.js: add reimbursement API service client
- components/shared/ConfirmDialog.vue: add shared confirm dialog component

web/src/services/reimbursements.js

@@ -0,0 +1,29 @@
+import { apiRequest } from './api.js'
+
+export function fetchExpenseClaims() {
+  return apiRequest('/reimbursements/claims')
+}
+
+export function fetchExpenseClaimDetail(claimId) {
+  return apiRequest(`/reimbursements/claims/${encodeURIComponent(String(claimId || '').trim())}`)
+}
+
+export function updateExpenseClaimItem(claimId, itemId, payload) {
+  return apiRequest(`/reimbursements/claims/${encodeURIComponent(String(claimId || '').trim())}/items/${encodeURIComponent(String(itemId || '').trim())}`, {
+    method: 'PATCH',
+    body: JSON.stringify(payload)
+  })
+}
+
+export function submitExpenseClaim(claimId) {
+  return apiRequest(`/reimbursements/claims/${encodeURIComponent(String(claimId || '').trim())}/submit`, {
+    method: 'POST',
+    body: JSON.stringify({})
+  })
+}
+
+export function deleteExpenseClaim(claimId) {
+  return apiRequest(`/reimbursements/claims/${encodeURIComponent(String(claimId || '').trim())}`, {
+    method: 'DELETE'
+  })
+}