feat: sincronizar scaffold completo del shape web-backend/python

Sincroniza el scaffold canónico desde templates/web-backend-python/ del
repo IDP. Reemplaza el placeholder mínimo previo (.gitea/workflows/ci.yaml,
README.md, .gitignore, catalog-info.yaml) por el scaffold completo
documentado en ADR-053 §3:

- code/ — FastAPI app con /health (db check), /metrics, /demo estático,
  middleware correlation_id, settings Pydantic, db.py con SQLAlchemy
- code/alembic/ — migración inicial vacía + env.py usando MIGRATION_DATABASE_URL
- code/tests/ — pytest + httpx TestClient (test_health, test_demo)
- helm/APP_NAME/ — chart con Deployment, Service, IngressRoute Traefik,
  NetworkPolicy, ServiceMonitor, Job alembic-upgrade como hook
  pre-upgrade,pre-install (backoffLimit: 0)
- coralware-shape.yaml — manifiesto v1alpha1 del contrato del shape
- claim-mariadb.yaml — AddonClaim declarativo (uso futuro ADR-052)
- catalog-info.yaml — entidad Backstage actualizada
- .gitea/workflows/APP_NAME-build.yaml — invoca reusable workflow ADR-038
  + job helm-deploy con KUBECONFIG_TENANT_B64

Placeholders __APP_NAME__, __TIER__, __TENANT_ID__, __TENANT_ID_NODASHES__
serán sustituidos server-side por repo-provisioner cuando materialice el
template para un tenant (pendiente — ADR-053 §11.5).

El openspec/ del golden path NO se sincroniza al repo Gitea (gobernanza
interna de Coralware).

Refs: ADR-052, ADR-053, poc-nexobms.md (PoC NexoBMS Demetrio).

code/pyproject.toml

@@ -0,0 +1,37 @@
+[project]
+name = "__APP_NAME__"
+version = "0.1.0"
+description = "Web backend Python (FastAPI + Alembic) — Golden Path web-backend/python"
+requires-python = ">=3.12"
+
+[tool.black]
+line-length = 100
+target-version = ["py312"]
+
+[tool.ruff]
+line-length = 100
+target-version = "py312"
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I", "B", "UP", "S"]
+ignore = ["S101"]
+
+[tool.ruff.lint.per-file-ignores]
+"tests/*" = ["S105", "S106"]
+
+[tool.bandit]
+exclude_dirs = ["tests", ".venv"]
+
+[tool.pytest.ini_options]
+pythonpath = ["."]
+testpaths = ["tests"]
+addopts = "-v --strict-markers"
+asyncio_mode = "auto"
+
+[tool.coverage.run]
+source = ["app"]
+omit = ["app/__init__.py", "tests/*"]
+
+[tool.coverage.report]
+fail_under = 80
+show_missing = true