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-song.svg

@@ -0,0 +1,12 @@
+<svg viewBox="0 0 22 22" xmlns="http://www.w3.org/2000/svg">
+    <style type="text/css" id="current-color-scheme">
+        .ColorScheme-Text {
+            color:#eff0f1;
+        }
+    </style>
+    <g class="ColorScheme-Text" fill="currentColor">
+        <path d="m6 12-3 2.5 3 2.5v-2h9v-1h-9z"/>
+        <path d="m16 5v2h-10c-1.662 0-3 1.338-3 3v1h1v-1c0-1.108.892-2 2-2h10v2l3-2.5z"/>
+        <path d="m17.29296875 11-1.5 1.5.70703125.70703125.5-.5v3.29296875h-1v1h3v-1h-1v-5z" fill-rule="evenodd"/>
+    </g>
+</svg>