chore: Update dependencies, switch Flutter web renderer to HTML, replace media_kit with video_player/chewie, and remove Hive volume from Docker setup.

lib/core/utils/crypto_utils.dart

@@ -0,0 +1,52 @@
+import 'package:crypto/crypto.dart';
+import 'package:uuid/uuid.dart';
+import 'dart:convert';
+
+/// Utility class for secure password hashing and verification
+class CryptoUtils {
+  static const _uuid = Uuid();
+
+  /// Generates a random salt using UUID v4
+  static String generateSalt() {
+    return _uuid.v4();
+  }
+
+  /// Hashes a password with the provided salt using SHA-256
+  /// 
+  /// Returns the hashed password as a hex string
+  static String hashPassword(String password, String salt) {
+    final bytes = utf8.encode(password + salt);
+    final digest = sha256.convert(bytes);
+    return digest.toString();
+  }
+
+  /// Verifies a password against a stored hash
+  /// 
+  /// [input] The password to verify
+  /// [storedHash] The complete stored hash in format "salt:hash"
+  /// 
+  /// Returns true if the password matches
+  static bool verifyPassword(String input, String storedHash) {
+    try {
+      final parts = storedHash.split(':');
+      if (parts.length != 2) return false;
+      
+      final salt = parts[0];
+      final expectedHash = parts[1];
+      final inputHash = hashPassword(input, salt);
+      
+      return inputHash == expectedHash;
+    } catch (e) {
+      return false;
+    }
+  }
+
+  /// Creates a complete password hash in the format "salt:hash"
+  /// 
+  /// This is the format stored in the database
+  static String createPasswordHash(String password) {
+    final salt = generateSalt();
+    final hash = hashPassword(password, salt);
+    return '$salt:$hash';
+  }
+}