dsh-multi-provider-usage: Aggregate quotas from three providers into the DSH sidebar

A DSH plugin maintained by "d" that consolidates quotas, time bars, and recharge balances from three providers—OpenCode GO, Command Code, and GLM Code Plan—into a sidebar component. It fetches data via a same-origin proxy (`/provider-usage/*`) while keeping API keys within the host process. The plugin supports per-provider collapsing, failure isolation, balance rolling animations, and low-balance color changes. It features multi-source updates via npm, mirrors, and GitHub, as well as configuration options in the Plugins panel and a `/provider-usage` chat command. The NPM package name is `dsh-multi-provider-usage` (the repository name `dsh-provider-usage` is taken). Current version 0.8.4, MIT license, Node >= 18. A restart of DSH is required after installation.