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/description.svg

@@ -0,0 +1,14 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22 22">
+  <defs id="defs3051">
+    <style type="text/css" id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#eff0f1;
+      }
+      </style>
+  </defs>
+ <path 
+    style="fill:currentColor;fill-opacity:1;stroke:none" 
+    d="M 3 3 L 3 5 L 8 5 L 8 3 L 3 3 z M 10 3 L 10 4 L 19 4 L 19 3 L 10 3 z M 5 6 L 5 7 L 19 7 L 19 6 L 5 6 z M 3 9 L 3 11 L 8 11 L 8 9 L 3 9 z M 10 9 L 10 10 L 19 10 L 19 9 L 10 9 z M 5 12 L 5 13 L 19 13 L 19 12 L 5 12 z M 5 15 L 5 16 L 19 16 L 19 15 L 5 15 z M 17 18 L 17 19 L 19 19 L 19 18 L 17 18 z "
+    class="ColorScheme-Text"
+    />  
+</svg>