Add test coverage for invoices, transactions, bookkeeping, and supplier
invoice API routes. Includes test helpers (createMockRequest,
parseJsonResponse, createMockRouteParams, createQueuedMockSupabase) and
fixture factories (makeInvoice, makeCustomer, makeSupplier,
makeSupplierInvoice, makeCompanySettings).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Remove influencer-specific features (campaigns, TikTok, gifts, shadow ledger,
contracts, briefings) and consolidate into a clean ERP foundation with core
bookkeeping, invoicing, receipts, tax reporting, and calendar functionality.
Reorganize database migrations into a clean numbered sequence.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>