fix(daemon): handle systemctl is-enabled exit 4 (not-found) on Ubuntu (#33634)

Merged via squash.

Prepared head SHA: 67dffc3ee2
Co-authored-by: Yuandiaodiaodiao <33371662+Yuandiaodiaodiao@users.noreply.github.com>
Co-authored-by: shakkernerd <165377636+shakkernerd@users.noreply.github.com>
Reviewed-by: @shakkernerd

src/daemon/systemd.ts

@@ -143,7 +143,10 @@ async function execSystemctl(
 }
 
 function readSystemctlDetail(result: { stdout: string; stderr: string }): string {
-  return (result.stderr || result.stdout || "").trim();
+  // Concatenate both streams so pattern matchers (isSystemdUnitNotEnabled,
+  // isSystemctlMissing) can see the unit status from stdout even when
+  // execFileUtf8 populates stderr with the Node error message fallback.
+  return `${result.stderr} ${result.stdout}`.trim();
 }
 
 function isSystemctlMissing(detail: string): boolean {