DSH Balance Panel: Centralized View of Provider Balances and Key Status in DSH

`dsh-balance-panel` is a DeepSeek Harness (DSH) plugin developed by wycto, designed to centrally display the models, key status, and balance details of configured providers in DSH. The plugin provides a balance entry point at the bottom of the Web UI sidebar; clicking it opens a full-screen panel that shows model chips, balance details, and status badges for each provider, with automatic refresh every 5 minutes. Core features include displaying only actually configured providers and models, a built-in official DeepSeek balance API, support for custom balance query APIs for other providers, and per-provider display of the `apiKeyEnv` credential configuration status (keys never enter the frontend). Installation requires the npm package name `@wycto/dsh-balance-panel`; through