feat: add safe owner-only migration reset (#1682)

* feat: add safe company migration reset

* fix: harden company reset eligibility

* fix: close company reset compliance gaps

* test: fix migration reset pg-real probes

* fix: preserve migration archive access

* docs: explain migration numbering continuity

* fix: block reset with VAT workflow state

* fix: block externally staged reset data

* fix: address migration reset review findings

* fix: clear stale migration archive estimate

* fix: retry migration archive estimates

lib/errors/structured-errors.ts

@@ -2698,6 +2698,41 @@ const COMPANY: Record<string, StructuredErrorEntry> = {
     message_sv: 'Företaget kunde inte skapas.',
     message_en: 'Failed to create company.',
   },
+  COMPANY_RESET_NOT_FOUND: {
+    httpStatus: 404,
+    message_sv: 'Företaget kunde inte hittas.',
+    message_en: 'Company not found.',
+  },
+  COMPANY_RESET_FORBIDDEN: {
+    httpStatus: 403,
+    message_sv: 'Endast företagets ägare kan starta om en migrering.',
+    message_en: 'Only the company owner can reset a migration.',
+  },
+  COMPANY_RESET_INELIGIBLE: {
+    httpStatus: 409,
+    message_sv: 'Företaget kan inte återställas med självservice. Kontakta supporten för en individuell bedömning.',
+    message_en: 'The company is not eligible for a self-service reset. Contact support for an individual review.',
+  },
+  COMPANY_RESET_CONFIRMATION_MISMATCH: {
+    httpStatus: 400,
+    message_sv: 'Företagsnamnet stämmer inte överens.',
+    message_en: 'The company name does not match.',
+  },
+  COMPANY_RESET_REASON_INVALID: {
+    httpStatus: 400,
+    message_sv: 'Beskriv varför migreringen behöver göras om med 20 till 1 000 tecken.',
+    message_en: 'Explain why the migration must be redone using 20 to 1,000 characters.',
+  },
+  COMPANY_RESET_CONFIRMATION_REQUIRED: {
+    httpStatus: 400,
+    message_sv: 'Alla säkerhetsbekräftelser krävs.',
+    message_en: 'All safety confirmations are required.',
+  },
+  COMPANY_RESET_FAILED: {
+    httpStatus: 500,
+    message_sv: 'Migreringen kunde inte startas om. Inga ändringar har sparats.',
+    message_en: 'The migration reset failed. No changes were saved.',
+  },
 }
 
 const API_KEY: Record<string, StructuredErrorEntry> = {