feat(ClubSettings): add member data quality requirements configuration

- Introduced new settings for member data quality requirements in club settings, allowing configuration of required fields such as street, postal code, city, phone, and email.
- Updated the backend to handle the new memberDataQualityRequirements field in club settings.
- Enhanced the frontend to display and manage these requirements in the ClubSettings view, improving user experience and data integrity.
- Added localization support for new terms related to member data quality across multiple languages.

backend/controllers/clubsController.js

@@ -60,12 +60,19 @@ export const updateClubSettings = async (req, res) => {
   try {
     const { authcode: token } = req.headers;
     const { clubid } = req.params;
-    const { greetingText, associationMemberNumber, myTischtennisFedNickname, autoFetchRankings } = req.body;
+    const {
+      greetingText,
+      associationMemberNumber,
+      myTischtennisFedNickname,
+      autoFetchRankings,
+      memberDataQualityRequirements
+    } = req.body;
     const updated = await ClubService.updateClubSettings(token, clubid, {
       greetingText,
       associationMemberNumber,
       myTischtennisFedNickname,
-      autoFetchRankings
+      autoFetchRankings,
+      memberDataQualityRequirements
     });
     res.status(200).json(updated);
   } catch (error) {

backend/migrations/20260415_add_member_data_quality_requirements_to_clubs.sql

@@ -0,0 +1,6 @@
+-- Migration: Add per-club member data quality requirements.
+-- Controls which optional contact/address fields count as required on /members.
+
+ALTER TABLE clubs
+  ADD COLUMN IF NOT EXISTS member_data_quality_requirements JSON NULL
+    COMMENT 'Configures which member fields are required for data quality checks';

backend/models/Club.js

@@ -29,6 +29,12 @@ const Club = sequelize.define('Club', {
     defaultValue: false,
     field: 'auto_fetch_rankings',
     comment: 'Enable automatic TTR/QTTR rankings fetch for this club'
+  },
+  memberDataQualityRequirements: {
+    type: DataTypes.JSON,
+    allowNull: true,
+    field: 'member_data_quality_requirements',
+    comment: 'Configures which member fields are required for data quality checks'
   }
 }, {
   tableName: 'clubs',

backend/services/clubService.js

@@ -71,7 +71,8 @@ class ClubService {
         greetingText,
         associationMemberNumber,
         myTischtennisFedNickname,
-        autoFetchRankings
+        autoFetchRankings,
+        memberDataQualityRequirements
     }) {
         await checkAccess(userToken, clubId);
         const club = await Club.findByPk(clubId);
@@ -81,9 +82,33 @@ class ClubService {
         const updates = { greetingText, associationMemberNumber };
         if (myTischtennisFedNickname !== undefined) updates.myTischtennisFedNickname = myTischtennisFedNickname || null;
         if (autoFetchRankings !== undefined) updates.autoFetchRankings = !!autoFetchRankings;
+        if (memberDataQualityRequirements !== undefined) {
+            updates.memberDataQualityRequirements = this.normalizeMemberDataQualityRequirements(memberDataQualityRequirements);
+        }
         return await club.update(updates);
     }
 
+    normalizeMemberDataQualityRequirements(settings) {
+        const defaults = {
+            requireStreet: true,
+            requirePostalCode: true,
+            requireCity: true,
+            requirePhone: true,
+            requireEmail: true
+        };
+
+        if (!settings || typeof settings !== 'object' || Array.isArray(settings)) {
+            return defaults;
+        }
+
+        return Object.fromEntries(
+            Object.entries(defaults).map(([key, defaultValue]) => [
+                key,
+                typeof settings[key] === 'boolean' ? settings[key] : defaultValue
+            ])
+        );
+    }
+
     async approveUserClubAccess(userToken, clubId, toApproveUserId) {
         await checkAccess(userToken, clubId);
         const toApproveUserClub = await UserClub.findOne({