Reorganized error codes to use HTTP status code prefixes in string format

Error codes now follow format {HTTP_STATUS}-{XXX} where XXX is 000-999

Each HTTP status code gets its own 1000-code range (e.g., 401-000 to 401-999 for Unauthorized errors)

Error responses now include code field with standardized error codes

Enhanced token payload with additional claims

Enhanced caching for better performance

Improved error responses with actionable information

Added support for OAuth 2.0 client credentials flow

Implemented scope-based authorization

Added resource-specific access tokens

Optimized token validation for reduced latency

Enhanced token introspection with additional metadata

Added client management API endpoints

Support for client registration and configuration

Added ability to revoke tokens

Added support for role-based access control

Enhanced token validation with additional security checks

Improved error handling with detailed error messages

Optimized token generation for better performance

Enhanced logging for better debugging

Initial release of Core API authorization server

Support for basic authentication

JWT token issuance with configurable expiration

Token introspection endpoint

OpenID Connect discovery endpoint

JWKS endpoint for public key retrieval