feat(release): add RPM and Flatpak packaging support for Linux

- Add RPM bundle to Linux build targets in CI workflow
- Add Flatpak manifest, desktop entry, and AppStream metainfo
- Update release workflow to build and publish .rpm and .flatpak artifacts
- Update README docs with new Linux package formats and installation instructions
- Add .gitignore rules for Flatpak build artifacts

.github/workflows/release.yml

@@ -53,7 +53,10 @@ jobs:
             wget \
             file \
             patchelf \
-            libssl-dev
+            libssl-dev \
+            rpm \
+            flatpak \
+            flatpak-builder
           # GTK/GLib stack for gdk-3.0, glib-2.0, gio-2.0
           sudo apt-get install -y --no-install-recommends \
             libgtk-3-dev \
@@ -153,7 +156,7 @@ jobs:
 
       - name: Build Tauri App (Linux)
         if: runner.os == 'Linux'
-        run: pnpm tauri build
+        run: pnpm tauri build -- --bundles appimage,deb,rpm
 
       - name: Prepare macOS Assets
         if: runner.os == 'macOS'
@@ -271,6 +274,28 @@ jobs:
           else
             echo "No .deb found (optional)"
           fi
+          # 额外上传 .rpm（用于 Fedora/RHEL/openSUSE 等，不参与 Updater）
+          RPM=$(find src-tauri/target/release/bundle -name "*.rpm" | head -1 || true)
+          if [ -n "$RPM" ]; then
+            NEW_RPM="CC-Switch-${VERSION}-Linux.rpm"
+            cp "$RPM" "release-assets/$NEW_RPM"
+            echo "RPM package copied: $NEW_RPM"
+          else
+            echo "No .rpm found (optional)"
+          fi
+          # 额外上传 .flatpak（跨发行版；不参与 Updater）
+          if [ -n "$DEB" ]; then
+            echo "Building Flatpak bundle from .deb..."
+            cp "$DEB" flatpak/cc-switch.deb
+            flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+            flatpak install -y --user flathub org.gnome.Platform//46 org.gnome.Sdk//46
+            flatpak-builder --force-clean --user --disable-cache --repo flatpak-repo flatpak-build flatpak/com.ccswitch.desktop.yml
+            NEW_FLATPAK="CC-Switch-${VERSION}-Linux.flatpak"
+            flatpak build-bundle --runtime-repo=https://flathub.org/repo/flathub.flatpakrepo flatpak-repo "release-assets/$NEW_FLATPAK" com.ccswitch.desktop
+            echo "Flatpak bundle created: $NEW_FLATPAK"
+          else
+            echo "Skip Flatpak build: no .deb found"
+          fi
 
       - name: List prepared assets
         shell: bash
@@ -299,7 +324,7 @@ jobs:
 
             - **macOS**: `CC-Switch-${{ github.ref_name }}-macOS.zip`（解压即用）或 `CC-Switch-${{ github.ref_name }}-macOS.tar.gz`（Homebrew）
             - **Windows**: `CC-Switch-${{ github.ref_name }}-Windows.msi`（安装版）或 `CC-Switch-${{ github.ref_name }}-Windows-Portable.zip`（绿色版）
-            - **Linux**: `CC-Switch-${{ github.ref_name }}-Linux.AppImage`（AppImage）或 `CC-Switch-${{ github.ref_name }}-Linux.deb`（Debian/Ubuntu）
+            - **Linux**: `CC-Switch-${{ github.ref_name }}-Linux.AppImage`（AppImage）或 `CC-Switch-${{ github.ref_name }}-Linux.deb`（Debian/Ubuntu）或 `CC-Switch-${{ github.ref_name }}-Linux.rpm`（Fedora/RHEL/openSUSE）或 `CC-Switch-${{ github.ref_name }}-Linux.flatpak`（Flatpak）
 
             ---
             提示：macOS 如遇"已损坏"提示，可在终端执行：`xattr -cr "/Applications/CC Switch.app"`