//! OAuth 2.0 implementation for AT Protocol.
//!
//! Comprehensive OAuth support with DPoP, PKCE, JWT operations,
//! and secure storage abstractions for AT Protocol authentication.
/// DPoP (Demonstrating Proof of Possession) implementation for OAuth 2.0.
/// Base64 encoding and decoding utilities.
/// Error types and handling.
/// JSON Web Key (JWK) generation and management.
/// JSON Web Token (JWT) minting and verification.
/// PKCE (Proof Key for Code Exchange) implementation for OAuth 2.0 security.
/// OAuth resource and authorization server management.
/// OAuth 2.0 scope definitions and parsing for AT Protocol.
/// OAuth request storage abstraction for CRUD operations.
/// LRU-based implementation of OAuth request storage (requires `lru` feature).
/// OAuth workflow implementation for AT Protocol authorization flows.