Switch Linux packaging from AppImage to deb + rpm + PKGBUILD

AppImage library bundling causes cascading compatibility failures on
rolling-release distros (Arch, mesa 26+): libwayland-egl conflicts
break EGL, removing it cascades into GLib version mismatches, and so
on. Native packages sidestep this entirely.

- tauri.conf.json: targets now ["deb","rpm","nsis","msi","dmg","updater"]
  — no AppImage
- release.yml: drop LINUXDEPLOY_EXCLUDELIST workaround (no longer needed);
  update install instructions in release body
- PKGBUILD: added for Arch/Manjaro users; builds from source via git tag;
  desktop entry sets WEBKIT_DISABLE_DMABUF_RENDERER=1 (required on Wayland)
- README: install table updated with distro-specific commands

Arch users: build from source with PKGBUILD or `npm run tauri build`.
Ubuntu/Debian/Fedora/openSUSE: install the .deb or .rpm from Releases.

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

PKGBUILD

@@ -0,0 +1,53 @@
+# Maintainer: hoornet <harpos@getalby.com>
+pkgname=wrystr
+pkgver=0.1.5
+pkgrel=1
+pkgdesc="Cross-platform Nostr desktop client with Lightning integration"
+arch=('x86_64')
+url="https://github.com/hoornet/wrystr"
+license=('MIT')
+depends=(
+    'webkit2gtk-4.1'
+    'gtk3'
+    'libayatana-appindicator'
+    'openssl'
+)
+makedepends=(
+    'rust'
+    'cargo'
+    'nodejs'
+    'npm'
+)
+source=("$pkgname-$pkgver::git+https://github.com/hoornet/wrystr.git#tag=v$pkgver")
+sha256sums=('SKIP')
+
+build() {
+    cd "$pkgname-$pkgver"
+    npm install
+    npm run tauri build -- --bundles deb
+}
+
+package() {
+    cd "$pkgname-$pkgver"
+
+    install -Dm755 "src-tauri/target/release/wrystr" \
+        "$pkgdir/usr/bin/wrystr"
+
+    install -Dm644 "src-tauri/icons/128x128.png" \
+        "$pkgdir/usr/share/icons/hicolor/128x128/apps/wrystr.png"
+
+    install -Dm644 /dev/stdin \
+        "$pkgdir/usr/share/applications/wrystr.desktop" << 'EOF'
+[Desktop Entry]
+Name=Wrystr
+Comment=Nostr desktop client
+Exec=env WEBKIT_DISABLE_DMABUF_RENDERER=1 /usr/bin/wrystr
+Icon=wrystr
+Type=Application
+Categories=Network;InstantMessaging;
+StartupNotify=true
+EOF
+
+    install -Dm644 "LICENSE" \
+        "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}