feat(api): add recurring transaction endpoints (#1600)

* feat(api): add recurring transaction endpoints

* fix(api): return validation errors for recurring writes

* fix(api): harden recurring transaction request handling

* fix(api): require writable recurring account access

* fix(api): default null recurring manual flag

* fix(api): tighten recurring transaction contracts

* test(api): align recurring transaction fixtures

* docs(api): regenerate recurring transaction OpenAPI

app/views/api/v1/recurring_transactions/_recurring_transaction.json.jbuilder

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+json.id recurring_transaction.id
+json.amount recurring_transaction.amount_money.format
+money_to_minor_units = lambda do |money|
+  (money.amount * money.currency.minor_unit_conversion).round(0).to_i if money
+end
+json.amount_cents money_to_minor_units.call(recurring_transaction.amount_money)
+json.currency recurring_transaction.currency
+json.expected_day_of_month recurring_transaction.expected_day_of_month
+json.last_occurrence_date recurring_transaction.last_occurrence_date
+json.next_expected_date recurring_transaction.next_expected_date
+json.status recurring_transaction.status
+json.occurrence_count recurring_transaction.occurrence_count
+json.name recurring_transaction.name
+json.manual recurring_transaction.manual
+json.expected_amount_min recurring_transaction.expected_amount_min_money&.format
+json.expected_amount_min_cents money_to_minor_units.call(recurring_transaction.expected_amount_min_money)
+json.expected_amount_max recurring_transaction.expected_amount_max_money&.format
+json.expected_amount_max_cents money_to_minor_units.call(recurring_transaction.expected_amount_max_money)
+json.expected_amount_avg recurring_transaction.expected_amount_avg_money&.format
+json.expected_amount_avg_cents money_to_minor_units.call(recurring_transaction.expected_amount_avg_money)
+json.created_at recurring_transaction.created_at.iso8601
+json.updated_at recurring_transaction.updated_at.iso8601
+
+if recurring_transaction.account.present?
+  json.account do
+    json.id recurring_transaction.account.id
+    json.name recurring_transaction.account.name
+    json.account_type recurring_transaction.account.accountable_type&.underscore
+  end
+else
+  json.account nil
+end
+
+if recurring_transaction.merchant.present?
+  json.merchant do
+    json.id recurring_transaction.merchant.id
+    json.name recurring_transaction.merchant.name
+  end
+else
+  json.merchant nil
+end

app/views/api/v1/recurring_transactions/index.json.jbuilder

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+json.recurring_transactions @recurring_transactions do |recurring_transaction|
+  json.partial! "recurring_transaction", recurring_transaction: recurring_transaction
+end
+
+json.pagination do
+  json.page @pagy.page
+  json.per_page @per_page
+  json.total_count @pagy.count
+  json.total_pages @pagy.pages
+end

app/views/api/v1/recurring_transactions/show.json.jbuilder

@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+json.partial! "recurring_transaction", recurring_transaction: @recurring_transaction