First deployment

.github/workflows/quality-gates.yml

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+name: quality-gates
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  lint-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install project dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e .[dev]
+      - name: Ruff lint
+        run: python -m ruff check backend tests
+      - name: Pytest coverage and contracts
+        run: python -m pytest
+
+  security-scan:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install scanner
+        run: |
+          python -m pip install --upgrade pip
+          pip install pip-audit
+      - name: Dependency vulnerability scan
+        run: pip-audit