* docs: add example programs for common usage patterns
Adds four focused examples in examples/ directory:
- basic: drop-in logger with web UI
- namespaces: namespace-based logging by component
- client: programmatic log client with filtering
- log-levels: all log levels and filtering
Fixes#7
* feat(slog): add slog.Handler adapter for log-socket
Implements log/slog.Handler that routes structured log records into the
log-socket broadcasting system. Supports namespaces, WithAttrs,
WithGroup, and configurable minimum level.
Also adds Broadcast() as a public entry point for adapter packages
that construct log.Entry values directly.
* chore: update to Go 1.26, resolve slog LogValuer values
