feat: Add initial backend server with user authentication, session management, and playlist CRUD functionality.

bin/models/playlist.dart

@@ -0,0 +1,65 @@
+class Playlist {
+  final String id;
+  final String userId;
+  final String name;
+  final String serverUrl;
+  final String username;
+  final String password;
+  final String? dns;
+  final DateTime createdAt;
+  final DateTime updatedAt;
+
+  Playlist({
+    required this.id,
+    required this.userId,
+    required this.name,
+    required this.serverUrl,
+    required this.username,
+    required this.password,
+    this.dns,
+    required this.createdAt,
+    required this.updatedAt,
+  });
+
+  factory Playlist.fromMap(Map<String, dynamic> map) {
+    return Playlist(
+      id: map['id'] as String,
+      userId: map['user_id'] as String,
+      name: map['name'] as String,
+      serverUrl: map['server_url'] as String,
+      username: map['username'] as String,
+      password: map['password'] as String,
+      dns: map['dns'] as String?,
+      createdAt: DateTime.parse(map['created_at'] as String),
+      updatedAt: DateTime.parse(map['updated_at'] as String),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'userId': userId,
+      'name': name,
+      'serverUrl': serverUrl,
+      'username': username,
+      'password': password,
+      'dns': dns,
+      'createdAt': createdAt.toIso8601String(),
+      'updatedAt': updatedAt.toIso8601String(),
+    };
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'user_id': userId,
+      'name': name,
+      'server_url': serverUrl,
+      'username': username,
+      'password': password,
+      'dns': dns,
+      'created_at': createdAt.toIso8601String(),
+      'updated_at': updatedAt.toIso8601String(),
+    };
+  }
+}

bin/models/session.dart

@@ -0,0 +1,37 @@
+class Session {
+  final String id;
+  final String userId;
+  final String token;
+  final DateTime expiresAt;
+  final DateTime createdAt;
+
+  Session({
+    required this.id,
+    required this.userId,
+    required this.token,
+    required this.expiresAt,
+    required this.createdAt,
+  });
+
+  factory Session.fromMap(Map<String, dynamic> map) {
+    return Session(
+      id: map['id'] as String,
+      userId: map['user_id'] as String,
+      token: map['token'] as String,
+      expiresAt: DateTime.parse(map['expires_at'] as String),
+      createdAt: DateTime.parse(map['created_at'] as String),
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'user_id': userId,
+      'token': token,
+      'expires_at': expiresAt.toIso8601String(),
+      'created_at': createdAt.toIso8601String(),
+    };
+  }
+
+  bool get isExpired => DateTime.now().isAfter(expiresAt);
+}

bin/models/user.dart

@@ -0,0 +1,31 @@
+class User {
+  final String id;
+  final String username;
+  final bool isAdmin;
+  final DateTime createdAt;
+
+  User({
+    required this.id,
+    required this.username,
+    required this.isAdmin,
+    required this.createdAt,
+  });
+
+  factory User.fromMap(Map<String, dynamic> map) {
+    return User(
+      id: map['id'] as String,
+      username: map['username'] as String,
+      isAdmin: (map['is_admin'] as int) == 1,
+      createdAt: DateTime.parse(map['created_at'] as String),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'username': username,
+      'isAdmin': isAdmin,
+      'createdAt': createdAt.toIso8601String(),
+    };
+  }
+}