Add Tahesab jewelry accounting integration with multi-DB connections.

Encrypt tokens server-side, sync customers both ways, show balances/documents on the person Assets tab, and push sanads with idempotent Factor_Code logging.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/integrations/tahesab/tahesab.module.ts

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+import { Module } from '@nestjs/common';
+import { AuthModule } from '../../auth/auth.module';
+import { TahesabCryptoService } from './tahesab-crypto.service';
+import { TahesabHttpClient } from './tahesab-http.client';
+import { TahesabConnectionsService } from './connections.service';
+import { TahesabPersonLinkService } from './person-link.service';
+import { TahesabBalanceService } from './balance.service';
+import { TahesabDocumentsService } from './documents.service';
+import { TahesabController } from './tahesab.controller';
+
+@Module({
+  imports: [AuthModule],
+  controllers: [TahesabController],
+  providers: [
+    TahesabCryptoService,
+    TahesabHttpClient,
+    TahesabConnectionsService,
+    TahesabPersonLinkService,
+    TahesabBalanceService,
+    TahesabDocumentsService,
+  ],
+  exports: [
+    TahesabConnectionsService,
+    TahesabPersonLinkService,
+    TahesabBalanceService,
+    TahesabDocumentsService,
+  ],
+})
+export class TahesabModule {}