feat: implement user linking for members and update database schema for user associations

backend/models/Member.js

@@ -123,6 +123,13 @@ const Member = sequelize.define('Member', {
     type: DataTypes.INTEGER,
     allowNull: false,
   },
+  userId: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    unique: true,
+    field: 'user_id',
+    comment: 'Linked login account for personal member features',
+  },
   membershipStatus: {
     type: DataTypes.STRING,
     allowNull: false,

backend/models/index.js

@@ -223,6 +223,9 @@ User.hasMany(UserClub, { foreignKey: 'userId' });
 UserClub.belongsTo(Club, { foreignKey: 'clubId', as: 'club' });
 Club.hasMany(UserClub, { foreignKey: 'clubId' });
 
+User.hasOne(Member, { foreignKey: 'userId', as: 'memberProfile' });
+Member.belongsTo(User, { foreignKey: 'userId', as: 'user' });
+
 Group.belongsTo(DiaryDate, { foreignKey: 'diaryDateId', as: 'diaryDateGroup' });
 DiaryDate.hasMany(Group, { foreignKey: 'diaryDateId', as: 'groupsDiaryDate' });