ci(gitea): add offline-friendly test workflows and deploy on bt

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitea/workflows/test-backend.yml

@@ -0,0 +1,44 @@
+name: Test Backend
+
+on:
+  push:
+    branches:
+      - main
+      - bt
+  pull_request:
+    types:
+      - opened
+      - synchronize
+
+jobs:
+  test-backend:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout and run backend tests
+        run: |
+          set -euo pipefail
+          export PATH="${HOME}/.local/bin:${PATH}"
+          export UV_PYTHON_DOWNLOADS=automatic
+
+          git clone "http://172.17.0.1:3000/${{ github.repository }}.git" .
+          git checkout "${{ github.sha }}"
+
+          sudo apt-get update -qq
+          sudo apt-get install -y python3 python3-pip python3-venv ca-certificates
+
+          python3 -m pip install --user --upgrade pip
+          python3 -m pip install --user "uv>=0.4"
+
+          docker compose down -v --remove-orphans || true
+          docker compose up -d db mailcatcher
+
+          (cd backend && uv run bash scripts/prestart.sh)
+          (cd backend && uv run bash scripts/tests-start.sh "Coverage for ${{ github.sha }}")
+
+          docker compose down -v --remove-orphans || true
+
+          if [ -d backend/htmlcov ]; then
+            echo "Coverage HTML generated under backend/htmlcov (view on runner if needed)."
+          fi
+
+          (cd backend && uv run coverage report --fail-under=90)