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/DocumentItemRow.vue

@@ -128,6 +128,15 @@
                     :amount="total"
                     :currency="selectedCurrency"
                   />
+                  <span
+                    v-if="showBaseCurrencyEquivalent"
+                    class="block text-xs text-muted mt-1"
+                  >
+                    <BaseFormatMoney
+                      :amount="baseCurrencyTotal"
+                      :currency="companyCurrency"
+                    />
+                  </span>
                 </span>
                 <div class="flex items-center justify-center w-6 h-10 mx-2">
                   <BaseIcon
@@ -184,6 +193,7 @@ import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { required, between, maxLength, helpers, minValue } from '@vuelidate/validators'
 import useVuelidate from '@vuelidate/core'
+import { useCompanyStore } from '../../../stores/company.store'
 import DocumentItemRowTax from './DocumentItemRowTax.vue'
 import DragIcon from '@v2/components/icons/DragIcon.vue'
 import { generateClientId } from '../../../utils'
@@ -221,6 +231,7 @@ const props = withDefaults(defineProps<Props>(), {
 const emit = defineEmits<Emits>()
 
 const { t } = useI18n()
+const companyStore = useCompanyStore()
 
 const formData = computed<DocumentFormData>(() => {
   return props.store[props.storeProp] as DocumentFormData
@@ -285,6 +296,17 @@ const totalSimpleTax = computed<number>(() => {
 
 const totalTax = computed<number>(() => totalSimpleTax.value)
 
+const companyCurrency = computed(() => companyStore.selectedCompanyCurrency)
+
+const showBaseCurrencyEquivalent = computed<boolean>(() => {
+  return !!(formData.value.exchange_rate && (props.store as Record<string, unknown>).showExchangeRate)
+})
+
+const baseCurrencyTotal = computed<number>(() => {
+  if (!formData.value.exchange_rate) return 0
+  return Math.round(total.value * Number(formData.value.exchange_rate))
+})
+
 const rules = {
   name: {
     required: helpers.withMessage(t('validation.required'), required),