refactor(deps): migrate manual_api_test.py from requests to httpx

chore: rename project to kiro-gateway

fix(auth): separate SSO region from API region for AWS SSO OIDC (#16)

fix(auth): don't send scope in AWS SSO OIDC refresh (#14)

fix(auth): add detailed AWS SSO OIDC error logging (#14)

fix(auth): don't send profileArn for AWS SSO OIDC (causes 403) (#12)

feat(auth): add AWS SSO OIDC support for kiro-cli credentials (#12)

feat: enhance credential loading and logging in manual_api_test.py

feat: Complete Kiro OpenAI Gateway implementation