Add optimized multi-platform release CI/CD pipeline.

Split Windows builds into shared x64 prep and arch-specific packaging, add comprehensive caching, verification scripts, and a PR smoke workflow.

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/desktop-windows-x64.yml

@@ -24,13 +24,11 @@ jobs:
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-java@v4
-        with:
-          distribution: temurin
-          java-version: "17"
+      - uses: ./.github/actions/setup-java-gradle
       - uses: dtolnay/rust-toolchain@stable
         with:
           targets: x86_64-pc-windows-msvc
+      - uses: ./.github/actions/cache-cargo-windows
       - name: Set version
         shell: bash
         run: |