dsh-balance-whale: DeepSeek Harness Floating Balance Component

`dsh-balance-whale` is a client plugin for DeepSeek Harness (DSH) that addresses the pain point of frequently switching tabs to check balance. It displays the remaining API quota in real time via a floating whale girl icon in the bottom-right corner. The plugin supports automatic refresh (every 60 seconds), interactive detail cards, and security mechanisms: the API key is only read by the Host process, is not transmitted to the browser, and only local requests are monitored. Installation requires building from source and registering the plugin, with no additional configuration needed, making it suitable for privacy-conscious local developers.