feat(14-03): add per-tenant encrypted TenderEmailConfig + ownerTenantId write-side (D-13)

Prisma: new TenderEmailConfig model (per-tenant, tenantId @unique, mirrors
DkvModuleConfig) + Tender.ownerTenantId nullable column + index (D-13:
null = global/platform-wide, unchanged for all existing rows and every
public source; set = visible only to that tenant). Migration
20260723113917_tender_email_config_owner_tenant_id applied locally.

TenderEmailConfigService: safe-select admin CRUD (GET never returns the
password, only hasPassword — T-07-12) with DkvService's encrypt-preserve-
empty semantics, via CalendarCryptoService (AES-256-GCM).

RawTenderRecord/NormalizedTenderFields gain optional ownerTenantId,
threaded through TenderNormalizerService.assemble() unchanged.
TenderDedupService's CREATE branch writes ownerTenantId (defaulting to
null); the UPDATE branch deliberately never references it, so a tender
later also seen on a public source is never retroactively hidden.

EmailAlertAdapter.fetchTenders() now does the real per-tenant fan-out:
findMany({isActive:true}) across ALL tenants (deliberate, documented
cross-tenant platform-scheduler read, never forTenant()/RLS), decrypts
each tenant's credentials, picks imap/exchange provider, and tags every
extracted candidate with ownerTenantId — catch-per-tenant so one broken
mailbox never blocks the others.

tenders.module.ts: imports CalendarModule/InboxModule, registers
EmailAlertAdapter + TenderEmailConfigService, seeds an 'email-alert'
TenderSourcePollConfig row (pollGranularity='tick', isActive=false —
no default mailbox to activate yet, D-02 framework-ready stance).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/api/src/tenders/tender-normalizer.service.ts

@@ -183,6 +183,9 @@ export class TenderNormalizerService {
       sourceUrl: raw.sourceUrl ?? null,
       contentHash,
       publishedAt: raw.publishedAt ?? new Date(),
+      // D-13: passed through unchanged — undefined for every source except
+      // EmailAlertAdapter, which sets it to the configuring tenant's id.
+      ownerTenantId: raw.ownerTenantId,
     };
   }
 }