refactor(clubSettings): remove myTischtennis club ID and update related logic

- Removed the myTischtennis club ID field from club settings and related backend logic.
- Updated the database migration to eliminate the my_tischtennis_club_id column.
- Adjusted frontend components and services to reflect the removal of the club ID, ensuring the use of association member number instead.
- Enhanced user interface hints to clarify the use of association member number for rankings.

backend/controllers/clubsController.js

@@ -60,11 +60,10 @@ export const updateClubSettings = async (req, res) => {
   try {
     const { authcode: token } = req.headers;
     const { clubid } = req.params;
-    const { greetingText, associationMemberNumber, myTischtennisClubId, myTischtennisFedNickname, autoFetchRankings } = req.body;
+    const { greetingText, associationMemberNumber, myTischtennisFedNickname, autoFetchRankings } = req.body;
     const updated = await ClubService.updateClubSettings(token, clubid, {
       greetingText,
       associationMemberNumber,
-      myTischtennisClubId,
       myTischtennisFedNickname,
       autoFetchRankings
     });

backend/migrations/20260315_add_club_rankings_settings.sql

@@ -1,9 +1,8 @@
 -- Migration: Add myTischtennis rankings settings to clubs table
--- Enables per-club configuration of TTR/QTTR rankings fetch (club ID, federation, enable flag)
+-- Enables per-club configuration of TTR/QTTR rankings fetch.
+-- Club number comes from association_member_number (Verbands-Mitgliedsnummer).
 
 ALTER TABLE clubs
-  ADD COLUMN IF NOT EXISTS my_tischtennis_club_id VARCHAR(50) NULL
-    COMMENT 'myTischtennis club number for rankings (e.g. 43030)',
   ADD COLUMN IF NOT EXISTS my_tischtennis_fed_nickname VARCHAR(50) NULL
     COMMENT 'Federation short name for rankings (e.g. HeTTV)',
   ADD COLUMN IF NOT EXISTS auto_fetch_rankings BOOLEAN NOT NULL DEFAULT FALSE

backend/models/Club.js

@@ -17,12 +17,6 @@ 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,

backend/services/clubService.js

@@ -70,7 +70,6 @@ class ClubService {
     async updateClubSettings(userToken, clubId, {
         greetingText,
         associationMemberNumber,
-        myTischtennisClubId,
         myTischtennisFedNickname,
         autoFetchRankings
     }) {
@@ -80,7 +79,6 @@ class ClubService {
             throw new Error('clubnotfound');
         }
         const updates = { greetingText, associationMemberNumber };
-        if (myTischtennisClubId !== undefined) updates.myTischtennisClubId = myTischtennisClubId || null;
         if (myTischtennisFedNickname !== undefined) updates.myTischtennisFedNickname = myTischtennisFedNickname || null;
         if (autoFetchRankings !== undefined) updates.autoFetchRankings = !!autoFetchRankings;
         return await club.update(updates);

backend/services/memberService.js

@@ -396,14 +396,14 @@ class MemberService {
                 };
             }
 
-            const effectiveClubId = (club.myTischtennisClubId || '').trim() || account.clubId;
+            const effectiveClubId = (club.associationMemberNumber || '').trim() || account.clubId;
             const effectiveFedNickname = (club.myTischtennisFedNickname || '').trim() || account.fedNickname;
 
             if (!effectiveClubId || !effectiveFedNickname) {
                 console.error('[updateRatingsFromMyTischtennis] - Missing clubId or fedNickname:', {
                     clubId: effectiveClubId,
                     fedNickname: effectiveFedNickname,
-                    fromClub: !!(club.myTischtennisClubId && club.myTischtennisFedNickname)
+                    fromClub: !!(club.associationMemberNumber && club.myTischtennisFedNickname)
                 });
                 return {
                     status: 400,