Service: harden for unattended running (auto-restart, findable logs, resume)

Local checkpoint - NOT for public release. A "what else does a service need" pass.

- AUTO-RESTART ON CRASH: DoInstall now sets sc failure actions (restart 5s/10s/then 60s,
  reset daily). Without this a crashed service stays dead until reboot - fatal for an
  always-on streamer.
- FINDABLE LOGS: --run-service redirects the service's data dir to the machine-wide
  ProgramData\RemSound\service location, so its log sits next to its profile instead of
  buried in the SYSTEM account's AppData.
- POWER RESUME: the service handles OnPowerEvent and re-opens capture on wake (audio
  devices re-initialise after sleep; the device-change watcher usually catches it, but a
  resume doesn't always fire an endpoint change, so we re-open explicitly).
- Start/stop already auto-log to the Windows Event Log via ServiceBase.

Test: "Service registration args" now also checks the audio-service dependency and the
auto-restart failure args. Gate 27/27.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/RemSound.App/ServiceControl.cs

@@ -98,9 +98,17 @@ public static class ServiceControl
         if (rc != 0) return rc;
         // Best-effort description; failure here doesn't fail the install.
         RunSc($"description {ServiceName} \"{Description}\"");
+        // Auto-restart on crash: without this a crashed service stays dead until reboot, which defeats
+        // an always-on streamer. Restart 5s / 10s / then every 60s; reset the failure counter daily.
+        RunSc(BuildFailureArgs());
         return 0;
     }
 
+    /// <summary>The sc.exe "failure" args that make the service auto-restart on a crash. Pure, so a
+    /// self-test can verify the format.</summary>
+    internal static string BuildFailureArgs() =>
+        $"failure {ServiceName} reset= 86400 actions= restart/5000/restart/10000/restart/60000";
+
     /// <summary>Stops (if running) and deletes the service. Must be run elevated. Returns 0 on success or
     /// if it wasn't installed.</summary>
     public static int DoUninstall()