Add tournament name column to OfficialTournaments view. Update data structure to include tournament names for better clarity in participation details.

frontend/src/views/OfficialTournaments.vue

@@ -364,6 +364,7 @@
           <thead>
             <tr>
               <th>Mitglied</th>
+              <th>Turnier</th>
               <th>Konkurrenz</th>
               <th>Datum</th>
               <th>Platzierung</th>
@@ -372,6 +373,7 @@
           <tbody>
             <tr v-for="row in clubParticipationRows()" :key="row.key">
               <td>{{ row.memberName }}</td>
+              <td>{{ row.tournamentName }}</td>
               <td>{{ row.competitionName }}</td>
               <td>{{ row.date }}</td>
               <td>{{ row.placement || '–' }}</td>
@@ -836,6 +838,7 @@ export default {
             rows.push({
               key: `club-${t.tournamentId}-${e.competitionId}-${e.memberId}`,
               memberName: e.memberName,
+              tournamentName: t.tournamentName || t.title || `Turnier #${t.tournamentId}`,
               competitionName: e.competitionName,
               date: e.date || t.startDate || '–',
               placement: e.placement || null,