aigateway v0.2.0

Added

• (aigw-core) add canonical model, translator traits, and unify JsonObject- implement translate layer for openai, openai-compat, and anthropic providers

Fixed

• resolve CI failures — cargo fmt and clippy collapsible_if

Refactored

• Gemini forward-compat extra fields, normalize validation, umbrella crate aliases

Miscellaneous

• unify all crate versions via workspace.package