refactor: remove ray-serve (moved to dedicated repo)

Implements ADR-0024: Ray Repository Structure

ray-serve is now a standalone PyPI package repo:
- https://git.daviestechlabs.io/billy/ray-serve

kuberay-images now contains only Docker images for Ray workers

.gitea/workflows/publish-ray-serve.yaml

@@ -1,95 +0,0 @@
-name: Build and Publish ray-serve-apps
-
-on:
-  push:
-    branches:
-      - main
-    paths:
-      - 'ray-serve/**'
-      - '.gitea/workflows/publish-ray-serve.yaml'
-  pull_request:
-    branches:
-      - main
-    paths:
-      - 'ray-serve/**'
-  workflow_dispatch:
-
-env:
-  NTFY_URL: http://ntfy.observability.svc.cluster.local:80
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.11'
-
-      - name: Install ruff
-        run: pip install ruff
-
-      - name: Lint with ruff
-        run: |
-          cd ray-serve
-          ruff check .
-          ruff format --check .
-
-  publish:
-    needs: lint
-    runs-on: ubuntu-latest
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.11'
-
-      - name: Install build tools
-        run: pip install build twine
-
-      - name: Build package
-        run: |
-          cd ray-serve
-          python -m build
-
-      - name: Publish to Gitea PyPI
-        env:
-          TWINE_USERNAME: ${{ secrets.REGISTRY_USER }}
-          TWINE_PASSWORD: ${{ secrets.REGISTRY_TOKEN }}
-          TWINE_REPOSITORY_URL: http://gitea-http.gitea.svc.cluster.local:3000/api/packages/daviestechlabs/pypi
-        run: |
-          cd ray-serve
-          # Debug: check if secrets are set (don't print the token!)
-          echo "Username set: ${TWINE_USERNAME:+yes}"
-          echo "Password set: ${TWINE_PASSWORD:+yes}"
-          if [ -z "$TWINE_USERNAME" ] || [ -z "$TWINE_PASSWORD" ]; then
-            echo "ERROR: REGISTRY_USER or REGISTRY_TOKEN secrets not set"
-            exit 1
-          fi
-          # Use twine for proper PyPI upload protocol
-          python -m twine upload --verbose dist/*
-
-      - name: Notify on success
-        if: success()
-        run: |
-          curl -s -X POST "${{ env.NTFY_URL }}/gitea-ci" \
-            -H "Title: ray-serve-apps published" \
-            -H "Priority: default" \
-            -H "Tags: package,white_check_mark" \
-            -d "Published ray-serve-apps to Gitea PyPI"
-
-      - name: Notify on failure
-        if: failure()
-        run: |
-          curl -s -X POST "${{ env.NTFY_URL }}/gitea-ci" \
-            -H "Title: ray-serve-apps publish failed" \
-            -H "Priority: high" \
-            -H "Tags: package,x" \
-            -d "Failed to publish ray-serve-apps to Gitea PyPI"