v1.0.0 — First stable release of ULog

Release notes:

• Introduced ULog, an ultra-low-overhead asynchronous logger designed for the uvent runtime.
• Fully coroutine-compatible logging system with minimal synchronization and allocation overhead.
• Supports multi-sink output (console, file) and asynchronous flush tasks.
• Built-in log rotation coroutine with configurable rotation size and policy.
• Compile-time configuration via ULOG_LEVEL, ULOG_BUFFER_CAPACITY, and ULOG_ROTATION_ENABLED.
• Graceful shutdown ensures all buffered entries are flushed on termination.
• Provides both high-level (ulog::info, ulog::warn, etc.) and low-level APIs for fine control.
• Integrated with uvent’s coroutine scheduler for zero blocking in hot paths.
• First public, production-ready version of the logger.