v1.2.0

Release v1.2.0

Configuration and routing architecture update.

- Replace routes.txt with versioned YAML configuration for proxy, runtime, and ordered route rules.

- Require an explicit config file at startup while retaining field-level defaults.

- Add --init-config, --open-config, and --check-config management commands.

- Add strict schema, value, credential, and route-pattern validation shared by checks and startup.

- Preserve interface-scoped DNS and same-interface outbound connection guarantees.