cleanup: remove redundant workflows and simplify CI/CD

Removed 4 redundant workflow files:
- helm-publish.yaml (integrated into release-unified)
- helm-release.yaml.old (the auto-version-bump nightmare)
- release.yaml (replaced by release-unified)
- tag-release.md (old docs, replaced by README.md)

Now down to just 3 clean workflows:
- release-unified.yaml: Complete release process
- quick-fix.yaml: Emergency Docker builds
- build-and-push.yaml: Automatic CI for PRs/tags

Also updated documentation to reflect the simplified pipeline.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.github/workflows/release.yaml

@@ -1,51 +0,0 @@
-name: Release
-
-on:
-  push:
-    tags:
-      - 'v*'
-
-permissions:
-  contents: write
-  packages: write
-
-jobs:
-  release:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
-
-      - name: Generate Release Notes
-        id: notes
-        run: |
-          # Get the tag message or generate from commits
-          TAG_MESSAGE=$(git tag -l --format='%(contents)' ${{ github.ref_name }})
-          if [ -z "$TAG_MESSAGE" ]; then
-            # Generate from commit messages since last tag
-            PREV_TAG=$(git describe --tags --abbrev=0 ${{ github.ref_name }}^ 2>/dev/null || echo "")
-            if [ -z "$PREV_TAG" ]; then
-              COMMITS=$(git log --pretty=format:"- %s (%h)" ${{ github.ref_name }})
-            else
-              COMMITS=$(git log --pretty=format:"- %s (%h)" ${PREV_TAG}..${{ github.ref_name }})
-            fi
-            NOTES="## Changes\n\n${COMMITS}\n\n## Docker Image\n\n\`\`\`bash\ndocker pull ghcr.io/${{ github.repository }}:${{ github.ref_name }}\n\`\`\`"
-          else
-            NOTES="${TAG_MESSAGE}\n\n## Docker Image\n\n\`\`\`bash\ndocker pull ghcr.io/${{ github.repository }}:${{ github.ref_name }}\n\`\`\`"
-          fi
-          echo "notes<<EOF" >> $GITHUB_OUTPUT
-          echo -e "$NOTES" >> $GITHUB_OUTPUT
-          echo "EOF" >> $GITHUB_OUTPUT
-
-      - name: Create Release
-        uses: actions/create-release@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          tag_name: ${{ github.ref_name }}
-          release_name: Release ${{ github.ref_name }}
-          body: ${{ steps.notes.outputs.notes }}
-          draft: false
-          prerelease: false