The ebuild installs server.js under /usr/libexec/stremio and does not
require a launcher to set SERVER_PATH. Use the installed copy by default
to avoid a startup panic

diff --git a/src/server.rs b/src/server.rs
--- a/src/server.rs
+++ b/src/server.rs
@@ -19,7 +19,8 @@
 
 impl Server {
     pub fn new() -> Self {
-        let server_path = env::var("SERVER_PATH").expect("Failed to read SERVER_PATH env");
+        let server_path = env::var("SERVER_PATH")
+            .unwrap_or_else(|_| "/usr/libexec/stremio/server.js".into());
         let file = PathBuf::from(&server_path);
 
         Self {