Update container image name to paude-proxy-go-centos10

Rename quay.io/bbrowning/paude-proxy to
quay.io/bbrowning/paude-proxy-go-centos10 in release workflow and
contributing docs.

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

Author: bbrowning

.github/workflows/release.yml

@@ -105,7 +105,7 @@ jobs:
           VERSION: ${{ steps.version.outputs.version }}
           IS_PRERELEASE: ${{ steps.prerelease.outputs.is_prerelease }}
         run: |
-          IMAGE=quay.io/bbrowning/paude-proxy
+          IMAGE=quay.io/bbrowning/paude-proxy-go-centos10
           FULL="${IMAGE}:${VERSION}"
 
           podman manifest create "${FULL}"

CONTRIBUTING.md

@@ -42,7 +42,7 @@ The [release workflow](.github/workflows/release.yml) will:
 
 1. Lint and run all tests
 2. Build binaries for linux/amd64, linux/arm64, darwin/amd64, darwin/arm64
-3. Build and push multi-arch container images to `quay.io/bbrowning/paude-proxy`
+3. Build and push multi-arch container images to `quay.io/bbrowning/paude-proxy-go-centos10`
 4. Create a GitHub Release with auto-generated notes and the binaries attached
 
 **Stable vs pre-release:** Tags matching `vX.Y.Z` exactly (e.g. `v1.2.3`) are treated as stable releases and update the `latest` container tag. Anything else (e.g. `v1.2.3-rc1`) is marked as a pre-release and does not update `latest`.