feat(official-tournaments): implement reimport functionality for official tournaments

backend/services/officialTournamentService.js

@@ -96,6 +96,18 @@ class OfficialTournamentService {
     return repaired;
   }
 
+  async reimportOfficialTournament(clubId, tournamentId) {
+    const tournament = await OfficialTournament.findOne({ where: { id: tournamentId, clubId } });
+    if (!tournament) return null;
+    const updatedCount = await this.repairTournamentFromSource(clubId, tournament);
+    if (!tournament.sourceUrl) {
+      const error = new Error('Für dieses Turnier ist keine myTischtennis-Quelle hinterlegt.');
+      error.status = 400;
+      throw error;
+    }
+    return { id: String(tournament.id), updatedCount };
+  }
+
   async saveTournamentSuggestion(clubId, suggestionId) {
     const suggestion = await TournamentSuggestion.findOne({ where: { id: suggestionId, clubId } });
     if (!suggestion) return null;