Add hall key feature to member management, including UI updates for displaying and editing hall key status. Update API to handle hall key data in member records.

server/api/members.get.js

@@ -242,6 +242,7 @@ export default defineEventHandler(async (event) => {
     loginRole: member.loginRole,
     lastLogin: member.lastLogin,
     isMannschaftsspieler: member.isMannschaftsspieler,
+    hasHallKey: member.hasHallKey === true || member.hasHallenschluessel === true,
     notes: member.notes || '',
     // Sichtbarkeits-Flags explizit mitgeben
     showEmail: visibility.showEmail === undefined ? true : Boolean(visibility.showEmail),