update service worker

README.md

@@ -84,7 +84,7 @@ Run this on the Linux desktop client that should receive `mpv-handler://` links,
 https://github.com/akiirui/mpv-handler/releases/latest/download/mpv-handler-linux-amd64.zip
 ```
 
-The upstream project currently publishes an official Linux release for `amd64` only. On Raspberry Pi or other ARM Linux systems, build or obtain a compatible `mpv-handler` binary first, then point `--root` at that extracted folder instead.
+The upstream project currently publishes an official Linux release for `amd64` only. On Raspberry Pi or other ARM Linux systems, `npm run setup:mpv-handler` now tries to build a compatible binary automatically from upstream source if both `git` and Rust `cargo` are installed. If you prefer not to build locally, pass `--skip-source-build` and provide `--root` with a compatible extracted folder instead.
 
 3. Run the helper against the extracted folder:
 
@@ -92,7 +92,7 @@ The upstream project currently publishes an official Linux release for `amd64` o
 npm run setup:mpv-handler -- --root /path/to/extracted/mpv-handler-linux-amd64
 ```
 
-On Linux the helper copies the binary and desktop files into `~/.local`, writes `config.toml` to `~/.config/mpv-handler/config.toml` (or `$XDG_CONFIG_HOME/mpv-handler/config.toml`), and runs `xdg-mime` for both protocol handlers.
+On Linux the helper copies the binary and desktop files into `~/.local`, writes `config.toml` to `~/.config/mpv-handler/config.toml` (or `$XDG_CONFIG_HOME/mpv-handler/config.toml`), and runs `xdg-mime` for both protocol handlers. On non-`x64` Linux it also auto-builds a staged `mpv-handler` root under `~/.cache/api-mediaplayer/` before installing, unless you pass `--skip-source-build`.
 
 ### Android