- Changed OTP storage in Admin/auth/login.php from plaintext to sha256 hash
- Updated Admin/auth/verify_login.php to hash user input before comparison
- Replaced hardcoded /home/siro-api/ paths with environment variables:
- ERROR_LOG_PATH, ENV_FILE_PATH, SECRET_KEY_PAY_PATH, SECRET_KEY_PATH
- Falls back to __DIR__-relative paths when env vars are unset