Add OCI image labels, issue template config, paths-ignore, and metadata fixes

- Dockerfile: ARG VERSION + OCI labels (title, description, source, licenses, version)
- release.yml: pass VERSION build-arg to all four image builds
- docker-publish.yml: extend paths-ignore to cover community files
- .github/ISSUE_TEMPLATE/config.yml: disable blank issues, link to Discussions and wiki
- README.md: add Getting Help section
- pyproject.toml: expand description; add System Administrators audience classifier

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

.github/workflows/release.yml

@@ -125,6 +125,7 @@ jobs:
           file: ./Dockerfile
           platforms: linux/amd64,linux/arm64
           push: true
+          build-args: VERSION=${{ steps.tag.outputs.VERSION }}
           cache-from: type=gha,scope=release-gpu
           cache-to: type=gha,mode=max,scope=release-gpu
           tags: |
@@ -137,8 +138,10 @@ jobs:
           context: .
           file: ./Dockerfile
           platforms: linux/amd64,linux/arm64
-          build-args: VARIANT=cpu
           push: true
+          build-args: |
+            VARIANT=cpu
+            VERSION=${{ steps.tag.outputs.VERSION }}
           cache-from: type=gha,scope=release-cpu
           cache-to: type=gha,mode=max,scope=release-cpu
           tags: |
@@ -151,8 +154,10 @@ jobs:
           context: .
           file: ./Dockerfile
           platforms: linux/amd64
-          build-args: VARIANT=rocm
           push: true
+          build-args: |
+            VARIANT=rocm
+            VERSION=${{ steps.tag.outputs.VERSION }}
           cache-from: type=gha,scope=release-rocm
           cache-to: type=gha,mode=max,scope=release-rocm
           tags: |
@@ -165,8 +170,10 @@ jobs:
           context: .
           file: ./Dockerfile
           platforms: linux/amd64
-          build-args: VARIANT=intel
           push: true
+          build-args: |
+            VARIANT=intel
+            VERSION=${{ steps.tag.outputs.VERSION }}
           cache-from: type=gha,scope=release-intel
           cache-to: type=gha,mode=max,scope=release-intel
           tags: |