```

Add user authentication with password hashing

- Integrated Argon2 for password hashing and verification
- Added bcrypt and thiserror dependencies
- Updated database schema with admin and ban flags
- Implemented user account creation and login logic
- Enhanced error handling for database operations
```

migrations/002_create_admin_flag.sql

@@ -0,0 +1,2 @@
+ALTER TABLE users
+ADD COLUMN is_admin BOOLEAN DEFAULT FALSE;

migrations/003_create_ban_flag.sql

@@ -0,0 +1,5 @@
+ALTER TABLE users
+ADD COLUMN is_banned BOOLEAN DEFAULT FALSE;
+
+ALTER TABLE users
+ADD COLUMN ban_reason VARCHAR(255);