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Contract.orderNumberAtSalesPlatform (VARCHAR(191) NULL) mit Migration 20260619100000_contract_order_number_at_sales_platform (IF NOT EXISTS). Form-Input, Detail-Zeile mit Copy-Button, Audit-Mapping, Renewal-Copy und XSS-Strip-Allowlist analog zu den bestehenden Sales-Platform-Feldern. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>