fix: add Dart-pure PlaylistConfig for server and fix imports

bin/models/playlist_config.dart

@@ -0,0 +1,52 @@
+/// Pure Dart model for Xtream Codes playlist configuration
+/// This is a server-side copy without Hive/Equatable dependencies
+class PlaylistConfig {
+  final String id;
+  final String name;
+
+  /// Xtream server URL (without trailing slash)
+  final String dns;
+
+  final String username;
+
+  /// Xtream password
+  final String password;
+
+  final DateTime createdAt;
+
+  final bool isActive;
+
+  const PlaylistConfig({
+    required this.id,
+    required this.name,
+    required this.dns,
+    required this.username,
+    required this.password,
+    required this.createdAt,
+    this.isActive = true,
+  });
+
+  /// Creates a copy of this playlist with updated fields
+  PlaylistConfig copyWith({
+    String? id,
+    String? name,
+    String? dns,
+    String? username,
+    String? password,
+    DateTime? createdAt,
+    bool? isActive,
+  }) {
+    return PlaylistConfig(
+      id: id ?? this.id,
+      name: name ?? this.name,
+      dns: dns ?? this.dns,
+      username: username ?? this.username,
+      password: password ?? this.password,
+      createdAt: createdAt ?? this.createdAt,
+      isActive: isActive ?? this.isActive,
+    );
+  }
+
+  /// Generate Xtream API base URL
+  String get apiBaseUrl => '$dns/player_api.php';
+}