feat: initial qobuz-qt source

Lightweight Qt6 desktop client for Qobuz with a Rust audio backend
(Symphonia/CPAL via staticlib FFI). Mirrors the spotify-qt layout:
toolbar with playback controls, library/context docks on the left,
tabbed search side panel on the right, queue panel, now-playing dock.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

res/icons/media-playlist-repeat.svg

@@ -0,0 +1,10 @@
+<svg version="1.1" viewBox="0 0 22 22" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <style id="current-color-scheme" type="text/css">
+            .ColorScheme-Text {
+              color:#eff0f1;
+            }
+      </style>
+    </defs>
+    <path class="ColorScheme-Text" d="m16 5v2h-10c-1.662 0-3 1.338-3 3v1h1v-1c0-1.108 0.892-2 2-2h10v2l3-2.5zm2 6v1c0 1.108-0.892 2-2 2h-10v-2l-3 2.5 3 2.5v-2h10c1.662 0 3-1.338 3-3v-1z" fill="currentColor"/>
+</svg>