Support Pinyin slugs and consistent default paths for documents and public shares

Problem I’m using self-hosted Outline v1.12.0 via Docker with Chinese document titles. Chinese characters are currently omitted from the readable portion of document URLs. For example, a title containing Chinese text and “AI Native” produces a URL like: Meanwhile, publishing the same document generates a separate UUID-based share URL. Although the share path can be edited manually, naming every share individually adds unnecessary work. Proposed behavior Generate a readable slug from the document title and reuse it as the default public share path. For a document titled Python 快速开始, the desired URLs would be: Specifically: • Convert Chinese characters to tone-free Pinyin. • Preserve Latin words, use lowercase, and separate words with hyphens. • Use the same slug for the internal document URL and the default public share URL. • Continue allowing users to manually customize the public share path, including correcting Pinyin or ch…