0.4.1

Changed

• Consolidated shared CLI option handling and configuration fragment validation
  while preserving public APIs, help output, error messages, and exit codes.
• Reduced routing allocations by checking path segment boundaries without
  temporary strings and parsing request hosts only for host-specific routes.
• Replaced linear WebSocket registry lookups and removals with set operations.
• Removed a redundant filesystem metadata lookup when resolving static files,
  retaining canonical path and symlink boundary checks.