nerv-base/dsh-theme-eva: Replace DSH with an EVA Unit appearance

`dsh-theme-eva` is a DSH plugin maintained by nerv-base (under the Fun Outfit category), providing two mobile unit themes, Unit-01 and Unit-02, that can be switched in real-time: a code-drawn Plug Entry startup animation, a sync rate gauge based on real-world context pressure, a replacement for the native "Internal Power" indicator, and a restrained daily skin, while chat and code fonts remain unchanged. This article verifies the features, official build and installation process, settings, and runtime switching usage against the README, and explains usage notes such as Reduce motion fallback, dark mode locking, the MIT license, and limitations on rebroadcasting announcement audio.