Fix release: package Windows binary as zip instead of raw exe

Browsers flag direct .exe downloads as risky. Zip the Windows
binary the same way we already zip the macOS binary so users
download a safe archive and extract it themselves.

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

Author: WIndFate

.github/workflows/build.yml

@@ -64,12 +64,12 @@ jobs:
       - name: Package files for release
         run: |
           cd artifacts/Bili-Streamer-macOS && zip ../Bili-Streamer-macOS.zip Bili-Streamer && cd ../..
-          mv artifacts/Bili-Streamer-Windows/Bili-Streamer.exe artifacts/Bili-Streamer-Windows.exe
+          cd artifacts/Bili-Streamer-Windows && zip ../Bili-Streamer-Windows.zip Bili-Streamer.exe && cd ../..
 
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
         with:
           generate_release_notes: true
           files: |
             artifacts/Bili-Streamer-macOS.zip
-            artifacts/Bili-Streamer-Windows.exe
+            artifacts/Bili-Streamer-Windows.zip