[功能] RomM 桌面壳的原生播放路径 (window.rommNative)

Is your feature request related to a problem? Please describe.

romm-desktop is an Electron shell for RomM. Unlike Argosy, Grout, the Playnite plugin, romm-client or RomMix, it does not build a UI of its own: it loads the server's own frontend at runtime in a native window and injects a single global, window.rommNative. Its purpose is to launch a ROM in a locally installed emulator (RetroArch, PCSX2, and so on) instead of an in-browser core. When the server runs on the same machine it can also read the ROM straight off disk and skip the download.