feat: add cargo publish to release workflow

Publishes to crates.io automatically when a v* tag is pushed.
Requires CARGO_REGISTRY_TOKEN secret in the repo.

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

Author: yuanhao

.github/workflows/release.yml

@@ -91,9 +91,23 @@ jobs:
             yoyo-${{ github.ref_name }}-${{ matrix.target }}.zip
             yoyo-${{ github.ref_name }}-${{ matrix.target }}.zip.sha256
 
+  publish:
+    name: Publish to crates.io
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Publish
+        run: cargo publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+
   release:
     name: Create Release
-    needs: build
+    needs: [build, publish]
     runs-on: ubuntu-latest
     steps:
       - name: Download artifacts