setup --refresh-service: keep the launcher executable

systemd starts ~/.local/bin/anybot-run directly. install_systemd set 0755,
the refresh path rewrote the file without it, and the unit then died with
status=203/EXEC in a restart loop (seen on a Ubuntu hands box: service
enabled, binary fresh, nothing running). One make_executable for both.

src/setup.rs

@@ -42,6 +42,17 @@ fn write_atomic(path: &std::path::Path, body: String) -> std::io::Result<()> {
 
 /// Quote a path for a systemd ExecStart line: a home folder with spaces (or a quote sign)
 /// made the unit fail to start with no way to see why.
+/// The launcher is started by systemd (`ExecStart=`) and by the terminal, so it must be executable.
+fn make_executable(path: &std::path::Path) {
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        let _ = std::fs::set_permissions(path, std::fs::Permissions::from_mode(0o755));
+    }
+    #[cfg(not(unix))]
+    let _ = path;
+}
+
 fn systemd_quote(p: &std::path::Path) -> String {
     let mut out = String::from("\"");
     for c in p.display().to_string().chars() {
@@ -826,11 +837,7 @@ impl Plan {
         std::fs::create_dir_all(&bin).map_err(|e| format!("建立 {} 失敗：{e}", bin.display()))?;
         let launcher = bin.join("anybot-run");
         write_atomic(&launcher, launcher_script(self.role, exe, &self.env)).map_err(|e| format!("寫入 {} 失敗：{e}", launcher.display()))?;
-        #[cfg(unix)]
-        {
-            use std::os::unix::fs::PermissionsExt;
-            let _ = std::fs::set_permissions(&launcher, std::fs::Permissions::from_mode(0o755));
-        }
+        make_executable(&launcher);
         let units = home.join(".config/systemd/user");
         std::fs::create_dir_all(&units).map_err(|e| e.to_string())?;
         // An older setup (deploy/linux/hands.sh) used another service name.
@@ -1004,6 +1011,9 @@ fn refresh_service() -> i32 {
         eprintln!("✗ 寫入 {} 失敗：{e}", launcher.display());
         return 1;
     }
+    // systemd starts it directly: a launcher written without the execute bit fails the unit
+    // with status=203/EXEC and the service spins in a restart loop.
+    make_executable(&launcher);
     match systemctl(&["restart", UNIT]) {
         Ok(_) => {
             println!("已更新並重新啟動 AnyBot 服務。");