feat(PROJ-21): Phase 2+3+5+8 Multi-Tenancy + PROJ-2 EML/MBOX Upload
Phase 2a: userstore domain_admin/superadmin Rollen, User.TenantID,
ListByTenant, UpsertLDAPUser mit tenantID
Phase 2b: storage.Save() mit tenantID *int64, email_refs Tabelle,
GetTenantForMail, GetAllIDsByTenant, StatsByTenant
Phase 2c: JWT-Claims tenant_id/tenant_slug, Session.TenantID,
Login Domain-Erkennung via E-Mail-Domain
Phase 3: tenantMiddleware, Handler-Filterung (Users, Mail, Stats)
Phase 5: SMTP Domain-Routing via DomainToTenantFunc Callback,
config smtp.tenant_routing + default_tenant_id
Phase 8: archivmail migrate-tenants Subkommando
PROJ-2: Upload-Seite /admin/upload mit DropZone + Progress-Polling
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
sysops
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