mdka v2 Release

We have released v2 of mdka , a Rust-based HTML-to-Markdown converter. Originally developed as a core component for our internal systems, we have refined it into a general-purpose library for public release. v2 strikes a practical balance between conversion quality and runtime efficiency—delivering readable output without sacrificing speed or memory. By focusing solely on its core task, this "Unix-style" tool achieves a lightweight footprint while maintaining competitive performance. We are plea