feat(clubSettings): enhance club settings with myTischtennis integration

- Added new fields for myTischtennis club ID, federation nickname, and auto-fetch rankings in the club settings.
- Updated the backend to handle the new settings in the updateClubSettings method.
- Implemented automatic ranking updates for clubs based on the new settings in the autoUpdateRatingsService.
- Enhanced the frontend to support the new settings, including validation and user interface updates for better user experience.

backend/models/Club.js

@@ -17,6 +17,25 @@ const Club = sequelize.define('Club', {
     allowNull: true,
     field: 'association_member_number'
   },
+  myTischtennisClubId: {
+    type: DataTypes.STRING,
+    allowNull: true,
+    field: 'my_tischtennis_club_id',
+    comment: 'myTischtennis club number for rankings (e.g. 43030)'
+  },
+  myTischtennisFedNickname: {
+    type: DataTypes.STRING,
+    allowNull: true,
+    field: 'my_tischtennis_fed_nickname',
+    comment: 'Federation short name for rankings (e.g. HeTTV)'
+  },
+  autoFetchRankings: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    field: 'auto_fetch_rankings',
+    comment: 'Enable automatic TTR/QTTR rankings fetch for this club'
+  }
 }, {
   tableName: 'clubs',
   underscored: true,