feat: Equipment-System, Buchungsbearbeitung, Kundenadresse, LexOffice-Fix

- Vintage Modell hinzugefuegt
- Equipment Multi-Select (Neue Buchung + Bearbeitung)
- Kundenadresse in Formularen
- Bearbeiten-Seite fuer Buchungen
- Abbau-Zeiten in Formularen und Uebersicht
- Vertrag PDF nur bei Privatkunden
- LexOffice Kontakt-Erstellung Fix (BUSINESS)
- Zurueck-Pfeil auf Touren-Seite

lib/nextcloud-calendar.ts

@@ -13,19 +13,46 @@ export interface CalendarEvent {
 export class NextcloudCalendarService {
   private client: any;
   private initialized: boolean = false;
+  private initPromise: Promise<void> | null = null;
 
   async initialize() {
-    if (this.initialized) return;
+    // Wenn bereits am Initialisieren, warte auf Abschluss
+    if (this.initPromise) {
+      return this.initPromise;
+    }
 
+    // Wenn bereits initialisiert, fertig
+    if (this.initialized && this.client) {
+      return Promise.resolve();
+    }
+
+    // Neue Initialisierung starten
+    this.initPromise = this._doInitialize();
+    
+    try {
+      await this.initPromise;
+    } finally {
+      this.initPromise = null;
+    }
+  }
+
+  private async _doInitialize() {
     const serverUrl = process.env.NEXTCLOUD_URL;
     const username = process.env.NEXTCLOUD_USERNAME;
     const password = process.env.NEXTCLOUD_PASSWORD;
 
+    console.log('🔍 Nextcloud credentials check:');
+    console.log('   URL:', serverUrl);
+    console.log('   Username:', username);
+    console.log('   Password length:', password?.length, 'chars');
+
     if (!serverUrl || !username || !password) {
       throw new Error('Nextcloud credentials not configured');
     }
 
     try {
+      console.log('⏳ Creating Nextcloud CalDAV client...');
+      
       this.client = await createDAVClient({
         serverUrl: `${serverUrl}/remote.php/dav`,
         credentials: {
@@ -37,10 +64,12 @@ export class NextcloudCalendarService {
       });
 
       this.initialized = true;
-      console.log('✅ Nextcloud CalDAV client initialized');
-    } catch (error) {
+      console.log('✅ Nextcloud CalDAV client initialized successfully');
+    } catch (error: any) {
       console.error('❌ Failed to initialize Nextcloud CalDAV client:', error);
-      throw error;
+      this.initialized = false;
+      this.client = null;
+      throw new Error(`Nextcloud initialization failed: ${error.message}`);
     }
   }
 
@@ -120,22 +149,33 @@ export class NextcloudCalendarService {
       throw new Error('No calendars found in Nextcloud');
     }
 
-    const calendar = calendars[0];
+    // Suche nach "Buchungen" Kalender, sonst verwende ersten
+    let calendar = calendars.find((cal: any) => 
+      cal.displayName?.toLowerCase().includes('buchung')
+    );
+    
+    if (!calendar) {
+      console.warn('⚠️  Kein "Buchungen"-Kalender gefunden, verwende:', calendars[0].displayName);
+      calendar = calendars[0];
+    } else {
+      console.log('✅ Verwende Kalender:', calendar.displayName);
+    }
 
     const event: CalendarEvent = {
       uid: `savethemoment-booking-${booking.id}`,
       summary: `${booking.customerName} - ${booking.location?.name || 'Unbekannt'}`,
       description: `
-Buchung #${booking.id}
+Buchung #${booking.bookingNumber || booking.id}
 Kunde: ${booking.customerName}
 E-Mail: ${booking.customerEmail}
 Telefon: ${booking.customerPhone || 'N/A'}
-Event-Typ: ${booking.eventType}
+Event-Location: ${booking.eventLocation || booking.eventAddress}
 Status: ${booking.status}
-Fotobox: ${booking.photobox?.name || 'Keine Box'}
+Fotobox: ${booking.photobox?.model || 'Keine Box'}
 Standort: ${booking.location?.name || 'Unbekannt'}
+Preis: ${booking.calculatedPrice || 0}€
       `.trim(),
-      location: booking.location?.address || '',
+      location: `${booking.eventAddress || ''}, ${booking.eventZip || ''} ${booking.eventCity || ''}`.trim(),
       startDate: new Date(booking.eventDate),
       endDate: new Date(new Date(booking.eventDate).getTime() + 4 * 60 * 60 * 1000),
       status: booking.status,
@@ -143,10 +183,12 @@ Standort: ${booking.location?.name || 'Unbekannt'}
 
     try {
       await this.createEvent(calendar.url, event);
+      console.log('✅ Event in Nextcloud erstellt:', event.summary);
       return event;
-    } catch (error) {
+    } catch (error: any) {
       if (error.message?.includes('already exists') || error.response?.status === 412) {
         await this.updateEvent(calendar.url, event);
+        console.log('✅ Event in Nextcloud aktualisiert:', event.summary);
         return event;
       }
       throw error;
@@ -162,11 +204,20 @@ Standort: ${booking.location?.name || 'Unbekannt'}
       throw new Error('No calendars found in Nextcloud');
     }
 
-    const calendar = calendars[0];
+    // Suche nach "Buchungen" Kalender, sonst verwende ersten
+    let calendar = calendars.find((cal: any) => 
+      cal.displayName?.toLowerCase().includes('buchung')
+    );
+    
+    if (!calendar) {
+      calendar = calendars[0];
+    }
+
     const eventUid = `savethemoment-booking-${bookingId}`;
 
     try {
       await this.deleteEvent(calendar.url, eventUid);
+      console.log('✅ Event aus Nextcloud gelöscht:', eventUid);
     } catch (error) {
       console.error('Error removing booking from calendar:', error);
     }