feat(tournament): add participant gave-up functionality and UI updates

- Implemented setParticipantGaveUp and setExternalParticipantGaveUp methods in tournamentController to handle participant resignation.
- Updated ExternalTournamentParticipant and TournamentMember models to include a gaveUp field for tracking resignation status.
- Enhanced tournamentRoutes to include new endpoints for updating gave-up status.
- Modified TournamentGroupsTab and TournamentParticipantsTab components to display and manage gave-up status visually.
- Added localization strings for "gave up" and related hints in German.
- Updated TournamentResultsTab to reflect gave-up status in match results.

backend/models/ExternalTournamentParticipant.js

@@ -88,6 +88,12 @@ const ExternalTournamentParticipant = sequelize.define('ExternalTournamentPartic
         type: DataTypes.BOOLEAN,
         allowNull: false,
         defaultValue: false
+    },
+    gaveUp: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: false,
+        field: 'gave_up'
     }
 }, {
     underscored: true,

backend/models/TournamentMember.js

@@ -30,6 +30,12 @@ const TournamentMember = sequelize.define('TournamentMember', {
         type: DataTypes.BOOLEAN,
         allowNull: false,
         defaultValue: false
+    },
+    gaveUp: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: false,
+        field: 'gave_up'
     }
   }, {
   underscored: true,