docs: update README and add AUR automation

- Add installation instructions (AUR, Flatpak, AppImage)
- Document all API keys (Last.fm, Discogs, Spotify, Tidal)
- Add playlist import feature documentation
- Update project structure
- Add PKGBUILD for qbz-bin AUR package
- Add workflow to auto-update AUR on release
- Update .env.example with Spotify/Tidal variables

packaging/aur/PKGBUILD

@@ -0,0 +1,39 @@
+# Maintainer: blitzkriegfc <blitzkriegfc@proton.me>
+pkgname=qbz-bin
+pkgver=1.0.0
+pkgrel=1
+pkgdesc="Native Qobuz client for Linux with Hi-Fi audio support (pre-built binary)"
+arch=('x86_64')
+url="https://github.com/vicrodh/qbz"
+license=('MIT')
+depends=('webkit2gtk-4.1' 'gtk3' 'alsa-lib' 'libappindicator-gtk3')
+optdepends=(
+    'pipewire-alsa: PipeWire audio support'
+    'pipewire-pulse: PulseAudio compatibility'
+)
+provides=('qbz')
+conflicts=('qbz')
+options=('!strip')
+source=("${pkgname}-${pkgver}.tar.gz::https://github.com/vicrodh/qbz/releases/download/v${pkgver}/qbz_${pkgver}_amd64.tar.gz")
+sha256sums=('SKIP')
+
+package() {
+    cd "${srcdir}"
+
+    # Install binary
+    install -Dm755 "qbz" "${pkgdir}/usr/bin/qbz"
+
+    # Install desktop file
+    install -Dm644 "qbz.desktop" "${pkgdir}/usr/share/applications/qbz.desktop"
+
+    # Install icons
+    for size in 32x32 128x128 256x256; do
+        if [[ -f "icons/hicolor/${size}/apps/qbz.png" ]]; then
+            install -Dm644 "icons/hicolor/${size}/apps/qbz.png" \
+                "${pkgdir}/usr/share/icons/hicolor/${size}/apps/qbz.png"
+        fi
+    done
+
+    # Install license
+    install -Dm644 "${srcdir}/../LICENSE" "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE" 2>/dev/null || true
+}