feat: initial ray-serve-apps PyPI package

Implements ADR-0024: Ray Repository Structure

- Ray Serve deployments for GPU-shared AI inference
- Published as PyPI package for dynamic code loading
- Deployments: LLM, embeddings, reranker, whisper, TTS
- CI/CD workflow publishes to Gitea PyPI on push to main

Extracted from kuberay-images repo per ADR-0024

.gitea/workflows/publish.yaml

@@ -0,0 +1,89 @@
+name: Build and Publish ray-serve-apps
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'ray_serve/**'
+      - 'pyproject.toml'
+      - '.gitea/workflows/publish.yaml'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'ray_serve/**'
+      - 'pyproject.toml'
+  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: |
+          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: python -m build
+
+      - name: Publish to Gitea PyPI
+        env:
+          TWINE_USERNAME: ${{ secrets.REGISTRY_USER }}
+          TWINE_PASSWORD: ${{ secrets.REGISTRY_TOKEN }}
+          TWINE_REPOSITORY_URL: http://gitea-http.gitea.svc.cluster.local:3000/api/packages/daviestechlabs/pypi
+        run: |
+          if [ -z "$TWINE_USERNAME" ] || [ -z "$TWINE_PASSWORD" ]; then
+            echo "ERROR: REGISTRY_USER or REGISTRY_TOKEN secrets not set"
+            exit 1
+          fi
+          python -m twine upload --verbose dist/*
+
+      - name: Notify on success
+        if: success()
+        run: |
+          curl -s -X POST "${{ 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"