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/prisma/schema.prisma

@@ -197,6 +197,31 @@ model DkvModuleConfig {
   @@index([tenantId])
 }
 
+// Phase 14, Plan 03 (INGEST-05, CONFIG-02, D-06/D-07) — per-tenant portal-
+// alert mailbox config, mirroring DkvModuleConfig's shape/pattern exactly
+// (own tenantId @unique row, own encrypted creds — D-03: each module keeps
+// its own independent mailbox config, this is a SEPARATE mailbox from the
+// DKV invoice inbox). Credentials are encrypted via CalendarCryptoService
+// (same AES-256-GCM iv:authTag:ciphertext format as DkvModuleConfig/
+// SmtpConfig) and excluded from every API response (Safe-Select, T-07-12).
+model TenderEmailConfig {
+  id                  String   @id @default(uuid())
+  tenantId            String   @unique
+  protocol            String   @default("imap")    // 'imap' | 'exchange'
+  host                String?
+  port                Int?
+  encryption          String   @default("ssl-tls") // 'none' | 'starttls' | 'ssl-tls'
+  folder              String   @default("INBOX")
+  senderFilter        String?
+  domain              String?  // Exchange only: Windows domain (optional)
+  isActive            Boolean  @default(false)
+  encryptedInboxCreds String?  // AES-256-GCM: JSON { username, password } encrypted
+  createdAt           DateTime @default(now())
+  updatedAt           DateTime @updatedAt
+
+  @@index([tenantId])
+}
+
 model DkvVehicleMaster {
   id          String   @id @default(uuid())
   tenantId    String
@@ -285,6 +310,15 @@ model Tender {
   // for pre-existing rows by backfill-tender-source.ts (Plan 13-01 Task 2).
   // dedupKey above stays the SCHEMA-02 upsert target — NOT replaced here.
   fingerprint    String?
+  // Phase 14, Plan 03 (INGEST-05, D-13) — per-tenant visibility for PRIVATE
+  // sources only. null = global/platform-wide (D-03, unchanged for all
+  // public sources: DÖE/NetServer/cosinex/RSS — existing rows stay null,
+  // no backfill). Set = visible ONLY to that tenant (email-alert tenders,
+  // since an alert mailbox reflects one tenant's private subscription).
+  // Read filter: buildTenderWhere OR[{ownerTenantId:null},{ownerTenantId:tenant}].
+  // Write: dedup CREATE only sets this — the UPDATE branch never touches it,
+  // so a source later also seen globally is never retroactively hidden.
+  ownerTenantId  String?
   publishedAt    DateTime
   createdAt      DateTime  @default(now())
   updatedAt      DateTime  @updatedAt
@@ -295,7 +329,10 @@ model Tender {
   @@index([bundesland]) // FILTER-02: post-backfill Bundesland-Filter-Performance
   @@index([cpvDivisions], type: Gin) // FILTER-03: post-backfill CPV-Divisions-Filter-Performance (hasSome)
   @@index([fingerprint]) // SCHEMA-03: dedup resolver fingerprint-tier lookup
-  // Deliberately NO tenant column and NO tenant index — this is global data (D-03)
+  @@index([ownerTenantId]) // D-13: read-filter lookup for private (email-alert) tenders
+  // Deliberately NO tenant column/index for the platform-wide default (D-03)
+  // — ownerTenantId above is the sole, additive, nullable exception for
+  // privately-sourced tenders (D-13).
   triage  TenderTriage[]
   matches TenderMatch[]
   sources TenderSource[] // SCHEMA-03/D-03 — all source portals this tender was seen on