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/edit-copy.svg

@@ -0,0 +1,11 @@
+<!DOCTYPE svg>
+<svg viewBox="0 0 22 22" version="1.1" xmlns="http://www.w3.org/2000/svg">
+    <defs>
+        <style type="text/css" id="current-color-scheme">
+            .ColorScheme-Text {
+                color:#eff0f1;
+            }
+        </style>
+    </defs>
+    <path class="ColorScheme-Text" style="fill:currentColor; fill-opacity:1; stroke:none" d="M 3 3 L 3 17 L 7 17 L 7 19 L 17 19 L 17 10 L 13 6 L 12 6 L 9 3 L 3 3 Z M 4 4 L 8 4 L 8 6 L 7 6 L 7 16 L 4 16 L 4 4 Z M 8 7 L 12 7 L 12 11 L 16 11 L 16 18 L 8 18 L 8 7 Z"/>
+</svg>