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/distance-calculator.ts

@@ -0,0 +1,88 @@
+interface Coordinates {
+  lat: number;
+  lon: number;
+}
+
+interface DistanceResult {
+  distance: number;
+  duration: number;
+}
+
+export class DistanceCalculator {
+  private static readonly OSRM_API = 'https://router.project-osrm.org/route/v1/driving';
+
+  static async geocodeAddress(address: string): Promise<Coordinates | null> {
+    try {
+      const nominatimUrl = `https://nominatim.openstreetmap.org/search?format=json&q=${encodeURIComponent(address)}&limit=1`;
+      
+      const response = await fetch(nominatimUrl, {
+        headers: {
+          'User-Agent': 'SaveTheMoment-Atlas/1.0',
+        },
+      });
+
+      if (!response.ok) {
+        throw new Error(`Geocoding failed: ${response.statusText}`);
+      }
+
+      const data = await response.json();
+
+      if (!data || data.length === 0) {
+        console.warn(`No results found for address: ${address}`);
+        return null;
+      }
+
+      return {
+        lat: parseFloat(data[0].lat),
+        lon: parseFloat(data[0].lon),
+      };
+    } catch (error) {
+      console.error('Geocoding error:', error);
+      return null;
+    }
+  }
+
+  static async calculateDistance(
+    fromAddress: string,
+    toAddress: string
+  ): Promise<DistanceResult | null> {
+    try {
+      const fromCoords = await this.geocodeAddress(fromAddress);
+      const toCoords = await this.geocodeAddress(toAddress);
+
+      if (!fromCoords || !toCoords) {
+        console.error('Failed to geocode one or both addresses');
+        return null;
+      }
+
+      const url = `${this.OSRM_API}/${fromCoords.lon},${fromCoords.lat};${toCoords.lon},${toCoords.lat}?overview=false`;
+
+      const response = await fetch(url);
+
+      if (!response.ok) {
+        throw new Error(`OSRM API failed: ${response.statusText}`);
+      }
+
+      const data = await response.json();
+
+      if (!data.routes || data.routes.length === 0) {
+        console.error('No route found');
+        return null;
+      }
+
+      const route = data.routes[0];
+      
+      return {
+        distance: Math.round(route.distance / 1000 * 100) / 100,
+        duration: Math.round(route.duration / 60),
+      };
+    } catch (error) {
+      console.error('Distance calculation error:', error);
+      return null;
+    }
+  }
+
+  static formatAddress(address: string, zip: string, city: string): string {
+    return `${address}, ${zip} ${city}`.trim();
+  }
+}