feat(07-01): install DKV deps, add Prisma models, wire ScheduleModule + crypto export

- pnpm add imapflow@^1.4.3, pdf-parse@^2.4.5, xlsx@^0.18.5 to @tessera/api
- Append DkvModuleConfig, DkvVehicleMaster, DkvInvoiceHistory, SmtpConfig models to schema.prisma (15 models total)
- Add ScheduleModule.forRoot() to AppModule imports (prerequisite for DkvSchedulerService)
- Export CalendarCryptoService from CalendarModule (needed by DkvModule + SettingsModule)
- Create apps/api/src/dkv/dkv.types.ts with DkvVehicleBlock, DkvTransaction, InboxConfig, InboxEmail, InboxAttachment, ExportRow interfaces

apps/api/src/app.module.ts

@@ -1,6 +1,7 @@
 import { MiddlewareConsumer, Module, NestModule } from '@nestjs/common';
 import { ConfigModule } from '@nestjs/config';
 import { APP_GUARD, APP_INTERCEPTOR } from '@nestjs/core';
+import { ScheduleModule } from '@nestjs/schedule';
 import { AuthModule } from './auth/auth.module';
 import { JwtAuthGuard } from './auth/guards/jwt-auth.guard';
 import { RolesGuard } from './auth/guards/roles.guard';
@@ -20,6 +21,7 @@ import { UserModule } from './user/user.module';
 @Module({
   imports: [
     ConfigModule.forRoot({ isGlobal: true }),
+    ScheduleModule.forRoot(),
     PrismaModule,
     AuthModule,
     UserModule,