fix: restore ONNX Runtime features and switch to armv7 gnu target

- Restore ort-download-binaries and ort-load-dynamic features needed for fastembed
- Switch from armv7-unknown-linux-musleabihf to armv7-unknown-linux-gnueabihf
- Use cross-rs official image for armv7 gnu target which should have ONNX binaries

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: runonthespot

.github/workflows/release.yml

@@ -69,7 +69,7 @@ jobs:
 
           - build: linux-armv7
             os: ubuntu-latest
-            target: armv7-unknown-linux-musleabihf
+            target: armv7-unknown-linux-gnueabihf
             use-cross: true
 
           # macOS builds