Release v3.5: USB-card recovery, per-card adaptive buffer, one user folder, audit fixes

- Recover an unplugged/replugged output sound card automatically (issue #5):
  detect the dead WASAPI device and remember the receive-output selection so it
  re-ticks and re-opens when the card returns.
- Adaptive per-card WASAPI buffer target sized to each card's pull chunk, held
  stable so it never flits about under CPU/network load.
- Consolidate all per-user data (config, profiles, logs, sounds) into one
  "user settings and logs" folder; migrate every older layout; exclude it from
  the updater so custom cue sounds now survive updates.
- Mic-privacy detector: warn once when a Windows-blocked mic is switched on, or a
  profile loads with one already on.
- All warning/notice dialogs now come to the foreground even when minimised.
- Apply volume + mute on profile load (were saved but not restored).
- Crash-safe (atomic) profile/config saves.
- Fix two resource leaks (push-mode capture MMDevice; UPnP DeviceFound handler).
- Remove dead code (baseline-diff machinery, dead ASIO probes, no-op stubs).
- Docs: readme.html, MANUAL.md, About-box changelog and release notes for v3.5.

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

src/RemSound.App/RemSoundLog.cs

@@ -68,7 +68,7 @@ internal sealed class RemSoundLog : IDisposable
         if (fileCreationFailed) return false;
         try
         {
-            var dir = System.IO.Path.Combine(AppContext.BaseDirectory, "logs");
+            var dir = RemSound.Core.AppConfig.LogsDirectory;
             Directory.CreateDirectory(dir);
             var name = $"RemSound-{Sanitize(Environment.MachineName)}-{Environment.ProcessId}-{DateTime.Now:yyyyMMdd-HHmmss}.log";
             Path = System.IO.Path.Combine(dir, name);