feat(tournament): enhance external participant management with email and address fields

- Added email and address fields to the external participant model, allowing for more comprehensive participant information.
- Updated the tournament service and controller to handle the new fields when adding external participants.
- Modified frontend components to include input fields for email and address, improving user experience and data collection.
- Updated localization strings to support the new fields, ensuring clarity in the user interface.

backend/services/tournamentService.js

@@ -3369,7 +3369,7 @@ Ve    // 2. Neues Turnier anlegen
     }
 
     // Externe Teilnehmer hinzufügen
-    async addExternalParticipant(userToken, clubId, classId, firstName, lastName, club, birthDate, gender) {
+    async addExternalParticipant(userToken, clubId, classId, firstName, lastName, club, birthDate, gender, email = null, address = null) {
         await checkAccess(userToken, clubId);
         if (!classId) {
             throw new Error('Klasse ist erforderlich');
@@ -3432,6 +3432,8 @@ Ve    // 2. Neues Turnier anlegen
             firstName,
             lastName,
             club: club || null,
+            email: email || null,
+            address: address || null,
             birthDate: birthDate || null,
             gender: participantGender,
             groupId: null