Breaking: Complete session management rewrite with pointer-based API …

…and thread-safe concurrency.

Added comprehensive API and Web examples with full authentication flows.
Fingerprint package rewritten with enhanced device validation and security.
New session middleware with extensive test coverage.

docs: update package index with core/command and core/event packages

Add two new core packages to the documentation index:
- core/command: CQRS command pattern package
- core/event: Event-driven architecture package

Maintains existing documentation format and alphabetical ordering.

New command and event packages with CQRS and Watermill-inspired archi…

…tecture; breaking changes to lifecycle management

Major additions:
- core/command: Complete CQRS command dispatching package
- core/event: Watermill-inspired event processing system
- pkg/async: Error-only async execution with futures

Breaking changes:
- Event: CreateAt renamed to CreatedAt
- Command: Stop() replaced with context-based lifecycle management

Improvements:
- Enhanced server lifecycle and autocert management
- Improved thread-safety and concurrency control
- Comprehensive test suites for new packages

chore: update dependencies

- Update AWS SDK packages (v2)
- Update Postmark package
- Update Google RPC genproto package

Enhanced queue system with graceful shutdown, lifecycle management, a…

…nd observability metrics

Router inheritance improvements and comprehensive testing

- Enhanced error handler and context factory inheritance for mounted subrouters
- Added extensive test coverage for router mounting scenarios
- Improved code documentation and error messages

Queue enhancements: config factories and simplified architecture

Configuration management and request binding improvements

- New Binder type for HTTP request binding
- Enhanced server and session configuration with environment support
- Improved TLS error handling and context propagation

Improve TLS handling and error management

- Enhanced TLS context propagation in certificate retrieval
- Added sentinel errors for better error handling
- Refactored server package for cleaner architecture

Release v0.4.0

Add Let's Encrypt/ACME certificate management with automatic renewal and TLS configuration presets.
Includes new core/letsencrypt package for certificate automation and enhanced server package with autocert support.