Fix exchange rate parity across all document types

- Fix exchange-rate service types to match actual backend response shapes
  (exchangeRate array, activeProvider success/error, used currencies as strings)
- Add ExchangeRateConverter to payments, expenses, and recurring invoices
- Set currency_id from customer currency in invoice/estimate selectCustomer()
- Load globalStore.currencies in ExchangeRateConverter on mount
- Pass driver/key/driver_config params to getSupportedCurrencies in provider modal
- Fix OpenExchangeRateDriver validateConnection to use base=USD (free plan compat)
- Fix checkActiveCurrencies SQLite whereJsonContains with array values
- Remove broken currency/companyCurrency props from ExpenseCreateView, use stores
- Show base currency equivalent in document line items and totals when exchange
  rate is active

resources/scripts-v2/features/shared/document-form/DocumentTotals.vue

@@ -217,12 +217,20 @@
         <BaseFormatMoney :amount="store.getTotal" :currency="defaultCurrency" />
       </label>
     </div>
+
+    <!-- Base currency equivalent -->
+    <div v-if="showBaseCurrencyEquivalent" class="flex items-center justify-end w-full mt-1">
+      <label class="text-xs text-muted">
+        ≈ <BaseFormatMoney :amount="baseCurrencyGrandTotal" :currency="companyCurrency" />
+      </label>
+    </div>
   </div>
 </template>
 
 <script setup lang="ts">
 import { computed, ref, watch } from 'vue'
 import TaxSelectPopup from './TaxSelectPopup.vue'
+import { useCompanyStore } from '../../../stores/company.store'
 import { generateClientId } from '../../../utils'
 import type { Currency } from '../../../types/domain/currency'
 import type { TaxType } from '../../../types/domain/tax'
@@ -245,6 +253,7 @@ const props = withDefaults(defineProps<Props>(), {
   isLoading: false,
 })
 
+const companyStore = useCompanyStore()
 const taxModal = ref<HTMLElement | null>(null)
 
 const formData = computed<DocumentFormData>(() => {
@@ -263,6 +272,17 @@ const defaultCurrencySymbol = computed<string>(() => {
   return (curr?.symbol as string) ?? '$'
 })
 
+const companyCurrency = computed(() => companyStore.selectedCompanyCurrency)
+
+const showBaseCurrencyEquivalent = computed<boolean>(() => {
+  return !!(formData.value.exchange_rate && (props.store as Record<string, unknown>).showExchangeRate)
+})
+
+const baseCurrencyGrandTotal = computed<number>(() => {
+  if (!formData.value.exchange_rate) return 0
+  return Math.round(props.store.getTotal * Number(formData.value.exchange_rate))
+})
+
 watch(
   () => formData.value.items,
   () => setDiscount(),