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,

apps/api/src/calendar/calendar.module.ts

@@ -28,6 +28,6 @@ import { ExchangeProvider } from './providers/exchange.provider';
     ICSProvider,
     ExchangeProvider,
   ],
-  exports: [CalendarService],
+  exports: [CalendarService, CalendarCryptoService],
 })
 export class CalendarModule {}

apps/api/src/dkv/dkv.types.ts

@@ -0,0 +1,101 @@
+/**
+ * Shared types for the DKV Fleet Module.
+ *
+ * These interfaces are the single source of truth for data shapes exchanged
+ * between the parser, scheduler, export, and mail services.
+ */
+
+/**
+ * A single fuel transaction row extracted from a DKV E-Rechnung PDF.
+ */
+export interface DkvTransaction {
+  /** Date string in German format "DD.MM.YYYY" */
+  lieferdatum: string;
+  /** Service station city / location */
+  ort: string;
+  /** Odometer reading at time of fuelling (numeric, German thousands-dots stripped) */
+  kilometerstand: number;
+  /** Product name (e.g., "Diesel", "AdBlue") */
+  produkt: string;
+  /** Quantity dispensed (German decimal notation converted to JS float) */
+  menge: number;
+  /** Unit of measure (e.g., "L") */
+  einheit: string;
+  /** Net amount in EUR */
+  netto: number;
+  /** Gross amount in EUR */
+  brutto: number;
+}
+
+/**
+ * A vehicle section extracted from a DKV E-Rechnung PDF.
+ * Each block corresponds to one VEHICLE: ... CARD NO.: ... section.
+ */
+export interface DkvVehicleBlock {
+  /** License plate (Kennzeichen), e.g. "GP-JL 728E" */
+  kennzeichen: string;
+  /** DKV card number */
+  cardNumber: string;
+  /** All fuel transactions for this vehicle in the invoice */
+  transactions: DkvTransaction[];
+}
+
+/**
+ * Inbox connection configuration (supports IMAP and Exchange).
+ * Mirrors DkvModuleConfig from Prisma but with decrypted credentials.
+ */
+export interface InboxConfig {
+  /** 'imap' | 'exchange' */
+  protocol: string;
+  host: string;
+  port: number;
+  /** Optional username (may be empty for anonymous or Exchange-with-integrated-auth) */
+  username?: string;
+  /** Decrypted password (never persisted in this form) */
+  password?: string;
+  /** 'none' | 'starttls' | 'ssl-tls' */
+  encryption: string;
+  /** IMAP folder to monitor (e.g., "INBOX") */
+  folder: string;
+  /** Sender filter: only process emails from this address */
+  senderFilter?: string;
+}
+
+/**
+ * A single email attachment, already downloaded as a Buffer.
+ */
+export interface InboxAttachment {
+  filename: string;
+  contentType: string;
+  buffer: Buffer;
+}
+
+/**
+ * A fetched email message with its PDF attachments.
+ */
+export interface InboxEmail {
+  /** IMAP UID or Exchange item ID */
+  uid: number | string;
+  /** RFC 2822 Message-ID header */
+  messageId: string;
+  subject: string;
+  from: string;
+  date: Date;
+  attachments: InboxAttachment[];
+}
+
+/**
+ * A single row in the Excel export (5 columns per D-13).
+ */
+export interface ExportRow {
+  /** "DD.MM.YYYY" */
+  lieferdatum: string;
+  /** Resolved from format string, e.g. "{Marke}/{Modell}/{Kennzeichen}" */
+  fahrzeug: string;
+  /** "Vorname Nachname" from vehicle master */
+  fahrer: string;
+  /** Service station city from PDF */
+  ort: string;
+  /** Numeric odometer reading */
+  kilometerstand: number;
+}