fix(07): UAT fixes — SMTP test email, DKV routing, Exchange domain field

- SMTP: add test-to field, send real email via sendMail() instead of verify()
- SMTP: fix no_auth warning shown as error for open-relay servers
- DKV: register dkv-fleet in MODULE_REGISTRY (fixes "Modul nicht gefunden")
- DKV: add dynamic [category]/[moduleSlug]/settings + vehicles sub-routes
- DKV: settings/vehicles links use useParams for consistent URLs
- DKV: add gear icon settings link to module main page
- DKV: rename module to "DKV-Rechnung" in seed + translations
- DKV: add optional domain field for Exchange (WebCredentials 3rd arg)
- DKV: hide IMAP-only fields (Port/Verschlüsselung/Ordner) when Exchange selected
- DKV: hide Exchange-only field (Domain) when IMAP selected
- Prisma: add domain column to DkvModuleConfig

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/src/app/(portal)/modules/[category]/[moduleSlug]/settings/page.tsx

@@ -0,0 +1,25 @@
+'use client';
+
+import { useParams } from 'next/navigation';
+import DkvFleetSettingsPage from '@/app/(portal)/modules/dkv-fleet/settings/page';
+import { useTranslations } from 'next-intl';
+
+const SETTINGS_REGISTRY: Record<string, React.ComponentType> = {
+  'dkv-fleet': DkvFleetSettingsPage,
+};
+
+export default function DynamicModuleSettingsPage() {
+  const { moduleSlug } = useParams<{ category: string; moduleSlug: string }>();
+  const t = useTranslations('modules');
+
+  const Component = SETTINGS_REGISTRY[moduleSlug ?? ''];
+  if (!Component) {
+    return (
+      <div className="mx-auto max-w-2xl p-6 text-center text-muted-foreground">
+        {t('notFound')}
+      </div>
+    );
+  }
+
+  return <Component />;
+}

apps/web/src/app/(portal)/modules/[category]/[moduleSlug]/vehicles/page.tsx

@@ -0,0 +1,25 @@
+'use client';
+
+import { useParams } from 'next/navigation';
+import DkvFleetVehiclesPage from '@/app/(portal)/modules/dkv-fleet/vehicles/page';
+import { useTranslations } from 'next-intl';
+
+const VEHICLES_REGISTRY: Record<string, React.ComponentType> = {
+  'dkv-fleet': DkvFleetVehiclesPage,
+};
+
+export default function DynamicModuleVehiclesPage() {
+  const { moduleSlug } = useParams<{ category: string; moduleSlug: string }>();
+  const t = useTranslations('modules');
+
+  const Component = VEHICLES_REGISTRY[moduleSlug ?? ''];
+  if (!Component) {
+    return (
+      <div className="mx-auto max-w-2xl p-6 text-center text-muted-foreground">
+        {t('notFound')}
+      </div>
+    );
+  }
+
+  return <Component />;
+}

apps/web/src/app/(portal)/modules/dkv-fleet/page.tsx

@@ -2,6 +2,8 @@
 
 import { useCallback, useState } from 'react';
 import { useTranslations } from 'next-intl';
+import { useParams } from 'next/navigation';
+import Link from 'next/link';
 import { checkNow, type DkvHistoryEntry } from '@/lib/dkv-api';
 import { InvoiceHistoryTable } from './components/InvoiceHistoryTable';
 import { ExportFileList } from './components/ExportFileList';
@@ -33,6 +35,10 @@ function SpinnerIcon() {
  */
 export default function DkvFleetPage() {
   const t = useTranslations('dkvFleet');
+  const params = useParams<{ category?: string; moduleSlug?: string }>();
+  const basePath = params.category && params.moduleSlug
+    ? `/modules/${params.category}/${params.moduleSlug}`
+    : '/modules/dkv-fleet';
 
   const [isChecking, setIsChecking] = useState(false);
   const [pollError, setPollError] = useState<string | null>(null);
@@ -83,6 +89,18 @@ export default function DkvFleetPage() {
           </p>
         </div>
 
+        {/* Einstellungen-Link */}
+        <Link
+          href={`${basePath}/settings`}
+          className="rounded border border-border px-3 py-2 text-sm text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
+          title={t('settingsTitle')}
+        >
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
+            <circle cx="12" cy="12" r="3" />
+            <path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83-2.83l.06-.06A1.65 1.65 0 0 0 4.68 15a1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 2.83-2.83l.06.06A1.65 1.65 0 0 0 9 4.68a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 2.83l-.06.06A1.65 1.65 0 0 0 19.4 9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z" />
+          </svg>
+        </Link>
+
         {/* "Jetzt prüfen" button per 07-UI-SPEC button states */}
         <button
           type="button"

apps/web/src/app/(portal)/modules/dkv-fleet/settings/components/InboxConfigForm.tsx

@@ -64,6 +64,7 @@ interface FormState {
   pollIntervalMin: string;
   username: string;
   password: string; // intentionally blank on load (T-07-12)
+  domain: string;
   exportRecipient: string;
   vehicleFormatString: string;
   isActive: boolean;
@@ -79,6 +80,7 @@ const DEFAULT_FORM: FormState = {
   pollIntervalMin: '30',
   username: '',
   password: '', // blank — T-07-12
+  domain: '',
   exportRecipient: '',
   vehicleFormatString: '{Marke}/{Modell}/{Kennzeichen}',
   isActive: false,
@@ -95,6 +97,7 @@ function configToForm(config: DkvConfig): FormState {
     pollIntervalMin: String(config.pollIntervalMin),
     username: config.username ?? '',
     password: '', // NEVER pre-fill from server — T-07-12
+    domain: config.domain ?? '',
     exportRecipient: config.exportRecipient,
     vehicleFormatString: config.vehicleFormatString,
     isActive: config.isActive,
@@ -113,6 +116,7 @@ function formToPayload(
     senderFilter: form.senderFilter || undefined,
     pollIntervalMin: Number(form.pollIntervalMin),
     username: form.username || undefined,
+    domain: form.domain || undefined,
     exportRecipient: form.exportRecipient,
     vehicleFormatString: form.vehicleFormatString,
     isActive: form.isActive,
@@ -245,69 +249,94 @@ export function InboxConfigForm() {
         </select>
       </div>
 
-      {/* Host */}
+      {/* Host / EWS-URL */}
       <div>
         <label htmlFor="dkv-host" className={labelCls}>
-          {t('form.host')} *
+          {form.protocol === 'exchange' ? t('form.hostExchange') : t('form.host')} *
         </label>
         <input
           id="dkv-host"
           type="text"
           required
+          placeholder={form.protocol === 'exchange' ? 'https://mail.firma.de/EWS/Exchange.asmx' : 'imap.firma.de'}
           className={inputCls}
           value={form.host}
           onChange={(e) => update('host', e.target.value)}
         />
       </div>
 
-      {/* Port */}
-      <div>
-        <label htmlFor="dkv-port" className={labelCls}>
-          {t('form.port')} *
-        </label>
-        <input
-          id="dkv-port"
-          type="number"
-          required
-          className={inputCls}
-          value={form.port}
-          onChange={(e) => update('port', e.target.value)}
-        />
-      </div>
+      {/* IMAP-only: Port */}
+      {form.protocol === 'imap' && (
+        <div>
+          <label htmlFor="dkv-port" className={labelCls}>
+            {t('form.port')} *
+          </label>
+          <input
+            id="dkv-port"
+            type="number"
+            required
+            className={inputCls}
+            value={form.port}
+            onChange={(e) => update('port', e.target.value)}
+          />
+        </div>
+      )}
 
-      {/* Verschlüsselung */}
-      <div>
-        <label htmlFor="dkv-encryption" className={labelCls}>
-          {t('form.encryption')} *
-        </label>
-        <select
-          id="dkv-encryption"
-          className={inputCls}
-          value={form.encryption}
-          onChange={(e) =>
-            update('encryption', e.target.value as 'none' | 'starttls' | 'ssl-tls')
-          }
-        >
-          <option value="none">{t('form.encryptionNone')}</option>
-          <option value="starttls">STARTTLS</option>
-          <option value="ssl-tls">SSL-TLS</option>
-        </select>
-      </div>
+      {/* IMAP-only: Verschlüsselung */}
+      {form.protocol === 'imap' && (
+        <div>
+          <label htmlFor="dkv-encryption" className={labelCls}>
+            {t('form.encryption')} *
+          </label>
+          <select
+            id="dkv-encryption"
+            className={inputCls}
+            value={form.encryption}
+            onChange={(e) =>
+              update('encryption', e.target.value as 'none' | 'starttls' | 'ssl-tls')
+            }
+          >
+            <option value="none">{t('form.encryptionNone')}</option>
+            <option value="starttls">STARTTLS</option>
+            <option value="ssl-tls">SSL-TLS</option>
+          </select>
+        </div>
+      )}
 
-      {/* Ordner */}
-      <div>
-        <label htmlFor="dkv-folder" className={labelCls}>
-          {t('form.folder')} *
-        </label>
-        <input
-          id="dkv-folder"
-          type="text"
-          required
-          className={inputCls}
-          value={form.folder}
-          onChange={(e) => update('folder', e.target.value)}
-        />
-      </div>
+      {/* IMAP-only: Ordner */}
+      {form.protocol === 'imap' && (
+        <div>
+          <label htmlFor="dkv-folder" className={labelCls}>
+            {t('form.folder')} *
+          </label>
+          <input
+            id="dkv-folder"
+            type="text"
+            required
+            className={inputCls}
+            value={form.folder}
+            onChange={(e) => update('folder', e.target.value)}
+          />
+        </div>
+      )}
+
+      {/* Exchange-only: Domain */}
+      {form.protocol === 'exchange' && (
+        <div>
+          <label htmlFor="dkv-domain" className={labelCls}>
+            {t('form.domain')}
+          </label>
+          <input
+            id="dkv-domain"
+            type="text"
+            placeholder="CONTOSO"
+            className={inputCls}
+            value={form.domain}
+            onChange={(e) => update('domain', e.target.value)}
+          />
+          <p className="mt-1 text-xs text-muted-foreground">{t('form.domainHelp')}</p>
+        </div>
+      )}
 
       {/* Absenderfilter */}
       <div>

apps/web/src/app/(portal)/modules/dkv-fleet/settings/page.tsx

@@ -3,6 +3,7 @@
 import Link from 'next/link';
 import { useState } from 'react';
 import { useTranslations } from 'next-intl';
+import { useParams } from 'next/navigation';
 import { InboxConfigForm } from './components/InboxConfigForm';
 
 type ActiveTab = 'inbox' | 'vehicles';
@@ -14,6 +15,10 @@ type ActiveTab = 'inbox' | 'vehicles';
  */
 export default function DkvFleetSettingsPage() {
   const t = useTranslations('dkvFleet');
+  const params = useParams<{ category?: string; moduleSlug?: string }>();
+  const basePath = params.category && params.moduleSlug
+    ? `/modules/${params.category}/${params.moduleSlug}`
+    : '/modules/dkv-fleet';
   const [activeTab, setActiveTab] = useState<ActiveTab>('inbox');
 
   const tabCls = (tab: ActiveTab) =>
@@ -41,7 +46,7 @@ export default function DkvFleetSettingsPage() {
           </button>
           {/* Vehicles tab navigates to its own route */}
           <Link
-            href="/modules/dkv-fleet/vehicles"
+            href={`${basePath}/vehicles`}
             className={`px-4 py-2 text-sm transition-colors text-muted-foreground hover:text-foreground`}
           >
             {t('tabs.vehicles')}

apps/web/src/app/(portal)/modules/dkv-fleet/vehicles/page.tsx

@@ -2,6 +2,7 @@
 
 import Link from 'next/link';
 import { useTranslations } from 'next-intl';
+import { useParams } from 'next/navigation';
 import { VehicleTable } from '../settings/components/VehicleTable';
 
 /**
@@ -11,13 +12,17 @@ import { VehicleTable } from '../settings/components/VehicleTable';
  */
 export default function DkvFleetVehiclesPage() {
   const t = useTranslations('dkvFleet');
+  const params = useParams<{ category?: string; moduleSlug?: string }>();
+  const basePath = params.category && params.moduleSlug
+    ? `/modules/${params.category}/${params.moduleSlug}`
+    : '/modules/dkv-fleet';
 
   return (
     <div className="mx-auto max-w-5xl p-6">
       {/* Back link to settings */}
       <div className="mb-4">
         <Link
-          href="/modules/dkv-fleet/settings"
+          href={`${basePath}/settings`}
           className="text-sm text-muted-foreground hover:text-foreground transition-colors"
         >
           ← {t('tabs.inbox')} / {t('settingsTitle')}