arm64 pipeline

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: UniqueDing

.github/workflows/build-multi-platform.yml

@@ -21,12 +21,14 @@ jobs:
             arch: amd64
             os: ubuntu-latest
             build_command: flutter build linux --release --target-platform linux-x64
+            bundle_dir: x64
             artifact_base: ailurus-linux
             package_extension: AppImage
           - name: linux
             arch: arm64
             os: ubuntu-24.04-arm
             build_command: flutter build linux --release --target-platform linux-arm64
+            bundle_dir: arm64
             artifact_base: ailurus-linux
             package_extension: AppImage
           - name: windows
@@ -65,6 +67,7 @@ jobs:
         run: |
           git clone https://github.com/flutter/flutter.git --depth 1 -b stable "$HOME/flutter"
           echo "$HOME/flutter/bin" >> "$GITHUB_PATH"
+          export PATH="$HOME/flutter/bin:$PATH"
           flutter --disable-analytics
           flutter --version
 
@@ -74,10 +77,20 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y clang cmake ninja-build pkg-config libgtk-3-dev
 
-      - name: Enable desktop targets
+      - name: Enable Linux desktop target
+        if: runner.os == 'Linux'
         run: |
           flutter config --enable-linux-desktop
+
+      - name: Enable Windows desktop target
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
           flutter config --enable-windows-desktop
+
+      - name: Enable macOS desktop target
+        if: runner.os == 'macOS'
+        run: |
           flutter config --enable-macos-desktop
 
       - name: Get dependencies
@@ -105,9 +118,9 @@ jobs:
           sudo apt-get install -y desktop-file-utils wget
           rm -rf AppDir dist
           mkdir -p AppDir/usr dist
-          cp build/linux/x64/release/bundle/ailurus AppDir/usr/
-          cp -r build/linux/x64/release/bundle/lib AppDir/usr/
-          cp -r build/linux/x64/release/bundle/data AppDir/usr/
+          cp build/linux/${{ matrix.platform.bundle_dir }}/release/bundle/ailurus AppDir/usr/
+          cp -r build/linux/${{ matrix.platform.bundle_dir }}/release/bundle/lib AppDir/usr/
+          cp -r build/linux/${{ matrix.platform.bundle_dir }}/release/bundle/data AppDir/usr/
           cp assets/icons/app_icon_source.png AppDir/ailurus.png
           cat > AppDir/AppRun <<'EOF'
           #!/bin/sh