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

bin/utils/password_hasher.dart

@@ -0,0 +1,17 @@
+import 'dart:convert';
+import 'package:crypto/crypto.dart';
+
+class PasswordHasher {
+  /// Hash a password using SHA256 (simple implementation)
+  /// Note: In production, use a proper bcrypt implementation
+  static String hash(String password) {
+    final bytes = utf8.encode(password);
+    final digest = sha256.convert(bytes);
+    return digest.toString();
+  }
+
+  /// Verify a password against a hash
+  static bool verify(String password, String hash) {
+    return PasswordHasher.hash(password) == hash;
+  }
+}