51ae8a9c0a
Validate e-invoices / mustang (push) Successful in 43s
InvoiceOrder/CorrectionInvoiceOrder gain an optional order-level kleinunternehmer flag, snapshotted per order (same pattern as vatExempt) so a later toggle of the tenant's setting never rewrites an already-issued invoice. Takes precedence over vatExempt. - Visual PDF: "enthält X% MwSt." becomes the §19 UStG notice. - E-invoice XML: new UNTDID 5305 category "E" with a free-text exemption reason (no VATEX code — §19 UStG has none, BR-E-10 allows text alone). - New Mustang CI fixture + buildEInvoiceData unit test for the "E" path. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>