feat(07-04): DkvModule + registry seed + AppModule registration + i18n keys

- dkv.seed.ts: seedDkvModule with slug=dkv-fleet, category=fleet, isSystem=true
- dkv.module.ts: imports ModuleRegistryModule + CalendarModule (CalendarCryptoService)
  provides all 7 DKV services + 2 providers + controller; OnModuleInit seeds registry
- app.module.ts: DkvModule added to imports (ScheduleModule + SettingsModule from Plans 01/03)
- de.json + en.json: complete dkvFleet namespace (50+ keys incl. status, col, form, errors)
- settings namespace extended with categoryGeneral, categorySmtp, smtp sub-object

apps/web/src/messages/en.json

@@ -113,11 +113,25 @@
     "categoryDashboard": "Dashboard",
     "categoryWidgets": "Widgets",
     "categoryCalendar": "Calendar",
+    "categoryGeneral": "General",
+    "categorySmtp": "SMTP",
     "sourceDeleteConfirm": "Are you sure you want to delete this calendar source?",
     "sourceDeleteCta": "Delete source",
     "providerDeleteConfirm": "Are you sure you want to delete this search provider?",
     "providerDeleteCta": "Delete provider",
-    "cancel": "Cancel"
+    "cancel": "Cancel",
+    "smtp": {
+      "title": "SMTP Configuration",
+      "host": "Host",
+      "port": "Port",
+      "encryption": "Encryption",
+      "username": "Username",
+      "password": "Password",
+      "fromAddress": "Sender Address (From)",
+      "fromAddressHelp": "The email address shown as the sender.",
+      "save": "Save Settings",
+      "test": "Test Connection"
+    }
   },
   "widgets": {
     "emptyHeading": "No active widgets",
@@ -237,6 +251,87 @@
     "checking": "Checking...",
     "error": "Error checking domain"
   },
+  "dkvFleet": {
+    "pageTitle": "DKV Fleet",
+    "checkNow": "Check Now",
+    "checking": "Checking...",
+    "lastChecked": "Last checked: {time}",
+    "neverChecked": "Never checked",
+    "settingsTitle": "Module Settings",
+    "historyTitle": "Processing History",
+    "exportFilesTitle": "Recent Export Files",
+    "emptyHistory": "No invoices processed yet",
+    "emptyHistoryBody": "Click 'Check Now' to poll the inbox. New invoices will appear here automatically.",
+    "emptyExports": "No export files available yet",
+    "emptyVehicles": "No vehicles configured",
+    "emptyVehiclesBody": "Add vehicles manually or upload a CSV file.",
+    "status": {
+      "processed": "Processed",
+      "error": "Error",
+      "sendFailed": "Send Failed"
+    },
+    "col": {
+      "dateTime": "Date/Time",
+      "invoiceNumber": "Invoice Number",
+      "vehicles": "Vehicles",
+      "transactions": "Transactions",
+      "status": "Status",
+      "exportFile": "Export File",
+      "licensePlate": "License Plate",
+      "brand": "Make",
+      "model": "Model",
+      "driver": "Driver",
+      "actions": "Actions"
+    },
+    "addVehicle": "Add Vehicle",
+    "editVehicle": "Edit Vehicle",
+    "deleteVehicle": "Delete Vehicle",
+    "deleteVehicleBody": "Vehicle {plate} will be permanently removed from the master list. This action cannot be undone.",
+    "importCsv": "Import CSV",
+    "importMode": "Import Mode",
+    "importMerge": "Merge — add new vehicles, keep existing",
+    "importReplace": "Replace — delete all existing vehicles and re-import",
+    "importReplaceWarning": "All existing vehicles will be replaced.",
+    "importReplaceConfirmTitle": "Replace Vehicles?",
+    "importReplaceConfirmBody": "All existing vehicles will be replaced with the CSV data. This action cannot be undone.",
+    "importReplaceConfirmButton": "Replace",
+    "importSuccess": "{count} vehicles imported",
+    "vehicleCount": "{count} vehicles",
+    "tabs": {
+      "inbox": "Inbox",
+      "vehicles": "Vehicles"
+    },
+    "form": {
+      "protocol": "Protocol",
+      "host": "Host",
+      "port": "Port",
+      "encryption": "Encryption",
+      "encryptionNone": "None",
+      "folder": "Folder",
+      "senderFilter": "Sender Filter",
+      "pollInterval": "Poll Interval",
+      "pollIntervalSuffix": "Minutes",
+      "username": "Username",
+      "password": "Password",
+      "exportRecipient": "Export Recipient",
+      "vehicleFormat": "Vehicle Format String",
+      "vehicleFormatHelp": "Available placeholders: {Marke}, {Modell}, {Kennzeichen}, {Fahrer}",
+      "active": "Active",
+      "testConnection": "Test Connection",
+      "testTesting": "Testing connection...",
+      "testSuccess": "Connection successful",
+      "testFailed": "Connection failed: {error}",
+      "save": "Save Settings",
+      "cancel": "Cancel Editing",
+      "cancelDialog": "Cancel",
+      "showPassword": "Show password",
+      "hidePassword": "Hide password"
+    },
+    "errors": {
+      "pollFailed": "Could not check inbox. Review the configuration under 'Module Settings > Inbox'.",
+      "smtpFailed": "Export was created but could not be sent. The file is still available for manual download."
+    }
+  },
   "marketplace": {
     "title": "Marketplace",
     "subtitle": "Discover and activate modules for your tenant",