create project

frontend/lib/models/bill.dart

@@ -0,0 +1,48 @@
+enum BillType { expense, income }
+
+class Bill {
+  final String id;
+  final String userId;
+  final String? familyId;
+  final BillType type;
+  final double amount;
+  final String category;
+  final String note;
+  final String emoji;
+  final String time;
+  final String date;
+  final String createdAt;
+
+  const Bill({
+    required this.id,
+    required this.userId,
+    this.familyId,
+    required this.type,
+    required this.amount,
+    required this.category,
+    this.note = '',
+    this.emoji = '📝',
+    required this.time,
+    required this.date,
+    this.createdAt = '',
+  });
+
+  bool get isExpense => type == BillType.expense;
+  bool get isIncome => type == BillType.income;
+
+  factory Bill.fromJson(Map<String, dynamic> json) {
+    return Bill(
+      id: json['id'] as String? ?? '',
+      userId: json['userId'] as String? ?? '',
+      familyId: json['familyId'] as String?,
+      type: json['type'] as String? == 'income' ? BillType.income : BillType.expense,
+      amount: (json['amount'] as num?)?.toDouble() ?? 0,
+      category: json['category'] as String? ?? '',
+      note: json['note'] as String? ?? '',
+      emoji: json['emoji'] as String? ?? '📝',
+      time: json['time'] as String? ?? '00:00',
+      date: json['date'] as String? ?? '',
+      createdAt: json['createdAt'] as String? ?? '',
+    );
+  }
+}

frontend/lib/models/family.dart

@@ -0,0 +1,53 @@
+class FamilyMember {
+  final String userId;
+  final String nickname;
+  final String role;
+  final String joinedAt;
+
+  const FamilyMember({
+    required this.userId,
+    required this.nickname,
+    this.role = 'member',
+    this.joinedAt = '',
+  });
+
+  factory FamilyMember.fromJson(Map<String, dynamic> json) {
+    return FamilyMember(
+      userId: json['userId'] as String? ?? '',
+      nickname: json['nickname'] as String? ?? '',
+      role: json['role'] as String? ?? 'member',
+      joinedAt: json['joinedAt'] as String? ?? '',
+    );
+  }
+}
+
+class Family {
+  final String id;
+  final String name;
+  final String inviteCode;
+  final String createdBy;
+  final String createdAt;
+  final List<FamilyMember> members;
+
+  const Family({
+    required this.id,
+    required this.name,
+    required this.inviteCode,
+    this.createdBy = '',
+    this.createdAt = '',
+    this.members = const [],
+  });
+
+  factory Family.fromJson(Map<String, dynamic> json) {
+    return Family(
+      id: json['id'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      inviteCode: json['inviteCode'] as String? ?? '',
+      createdBy: json['createdBy'] as String? ?? '',
+      createdAt: json['createdAt'] as String? ?? '',
+      members: (json['members'] as List<dynamic>?)
+              ?.map((m) => FamilyMember.fromJson(m as Map<String, dynamic>))
+              .toList() ?? [],
+    );
+  }
+}

frontend/lib/models/user.dart

@@ -0,0 +1,45 @@
+class User {
+  final String id;
+  final String phone;
+  final String nickname;
+  final String? email;
+  final List<String> familyIds;
+  final String? activeFamilyId;
+  final String joinDate;
+  final String createdAt;
+
+  const User({
+    required this.id,
+    required this.phone,
+    required this.nickname,
+    this.email,
+    this.familyIds = const [],
+    this.activeFamilyId,
+    this.joinDate = '',
+    this.createdAt = '',
+  });
+
+  factory User.fromJson(Map<String, dynamic> json) {
+    return User(
+      id: json['id'] as String? ?? '',
+      phone: json['phone'] as String? ?? '',
+      nickname: json['nickname'] as String? ?? '',
+      email: json['email'] as String?,
+      familyIds: (json['familyIds'] as List<dynamic>?)?.cast<String>() ?? [],
+      activeFamilyId: json['activeFamilyId'] as String?,
+      joinDate: json['joinDate'] as String? ?? '',
+      createdAt: json['createdAt'] as String? ?? '',
+    );
+  }
+
+  Map<String, dynamic> toJson() => {
+    'id': id,
+    'phone': phone,
+    'nickname': nickname,
+    'email': email,
+    'familyIds': familyIds,
+    'activeFamilyId': activeFamilyId,
+    'joinDate': joinDate,
+    'createdAt': createdAt,
+  };
+}