DSH-Qixi: Qixi Easter Egg Plugin for DeepSeek Harness Web UI

`dsh-qixi` is a DeepSeek Harness plugin maintained by Zhang9628, licensed under MIT, specifically designed to provide a Qixi Festival theme extension for the DSH Web UI. The plugin includes four core features: enabling the sidebar heart toggle applies a pink rose theme skin, displays blessing banners, Canvas particle backgrounds, and a sharing floating button; entering `520` in the input field triggers a full-screen romantic text barrage; entering `情书` or `loveletter` generates typewriter-style acrostic love letters supporting random generation, rewriting, and favoriting; additionally, it supports generating shareable or downloadable cards sized 1080×1440 with 5 color theme options. Before installation, ensure the local environment has DeepSeek Harness set up, then execute `dsh plug