- Renamed unused `code_verifier` variables to `_code_verifier` for clarity. - Improved test readability by reformatting long lines and assertions. - Streamlined `get` request calls by consolidating parameters into single lines.
- Introduced E2E test coverage for OAuth Provider mode, covering metadata discovery, client management, authorization flows, token operations, consent management, and security checks. - Verified PKCE enforcement, consent submission, token rotation, and introspection. - Expanded fixtures and utility methods for testing real OAuth scenarios with PostgreSQL via Testcontainers.