Add lookup tables, payment methods, tax exemptions, and processor link APIs

Replace unit_status and item_condition pgEnums with company-scoped lookup
tables that support custom values. Add account_payment_method table,
tax_exemption table with approve/revoke workflow, and CRUD routes for
processor links. Validate inventory unit status/condition against lookup
tables at service layer.

packages/backend/src/test/helpers.ts

@@ -2,6 +2,7 @@ import type { FastifyInstance } from 'fastify'
 import { buildApp } from '../main.js'
 import { sql } from 'drizzle-orm'
 import { companies, locations } from '../db/schema/stores.js'
+import { UnitStatusService, ItemConditionService } from '../services/lookup.service.js'
 
 export const TEST_COMPANY_ID = '00000000-0000-0000-0000-000000000099'
 export const TEST_LOCATION_ID = '00000000-0000-0000-0000-000000000099'
@@ -44,6 +45,10 @@ export async function seedTestCompany(app: FastifyInstance): Promise<void> {
     companyId: TEST_COMPANY_ID,
     name: 'Test Location',
   })
+
+  // Seed lookup tables for the test company
+  await UnitStatusService.seedForCompany(app.db, TEST_COMPANY_ID)
+  await ItemConditionService.seedForCompany(app.db, TEST_COMPANY_ID)
 }
 
 /**