Release v4.3: speak status line (Tolk) + Logging tab with housekeeping

- New screen-reader hotkey "Speak the RemSound status information" (issue #13):
  reads the status line aloud through the active screen reader via Tolk, fires from
  anywhere (system-wide), unset by default. Built behind an IScreenReaderOutput seam
  so a future build can swap Tolk for Prism on Windows 10+ without touching callers.
  Tolk DLLs vendored under tolk/ and shipped next to the exe.
- New Logging tab in Preferences: Enable logs + Write logs now moved there, plus
  opt-in startup "warn if logs folder exceeds N MB" and "delete logs older than N days",
  and a "Delete all logs" button (Yes/No confirm). New LogMaintenance helper + AppConfig
  settings drive it.
- Manual (readme.html + regenerated MANUAL.md), About changelog and RELEASE_NOTES
  updated in plain English; csproj <Version> bumped to 4.3.

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

src/RemSound.Core/Profile.cs

@@ -212,6 +212,9 @@ public sealed class Profile
     /// <summary>Global hotkey that opens the Quick profile switch popup — a list of all profiles you
     /// can arrow through and press Enter to switch to, from anywhere in Windows. Unset by default.</summary>
     public HotkeyRecord? QuickProfileSwitchHotkey { get; set; }
+    /// <summary>Optional global hotkey that speaks the connection status line aloud through the active
+    /// screen reader (issue #13). Unset by default. Screen-reader specific.</summary>
+    public HotkeyRecord? SpeakStatusLineHotkey { get; set; }
     /// <summary>When true, this machine honours incoming Control packets from connected
     /// peers — adjusts the local volume slider or toggles mute. Default false: receiving
     /// remote control is opt-in even though the audio allow-list already gates who's