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Add OAuthConfig and OAuthHeaderProvider to the Rust core with support for five OAuth flows: ClientCredentials, AuthorizationCodePKCE, DeviceCode, AzureManagedIdentity, and WorkloadIdentity. Token acquisition and auto-refresh happen entirely in Rust. Python and TypeScript expose OAuthConfig as a plain config object that maps to the Rust header provider via FFI — no dynamic callbacks cross the language boundary. ConnectBuilder gains an oauth_config() method that replaces the API key requirement when OAuth is configured.