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).

helm/APP_NAME/values.yaml

@@ -0,0 +1,69 @@
+# Defaults sensatos para tier startup. El CI inyecta tier/tenantId via --set
+# leyendo valores del TenantProfile correspondiente.
+
+replicaCount: 1
+
+image:
+  repository: registry.coralsafety.com/__TENANT_ID_NODASHES__/__APP_NAME__
+  tag: latest
+  pullPolicy: Always
+  pullSecret: harbor-tenant-pull
+
+# Identidad del tenant — populated por --set desde el CI
+tenantId: ""
+tenantIdNodashes: ""
+tier: startup
+goldenPath: web-backend
+goldenPathLang: python
+
+database:
+  secretName: __APP_NAME__-db-creds
+
+config:
+  logLevel: INFO
+  correlationIdHeader: X-Correlation-ID
+  openapiRequireAuth: false
+  keycloakIssuer: ""
+  staticDemoPath: /app/static/demo
+
+resources:
+  requests:
+    cpu: 50m
+    memory: 128Mi
+  limits:
+    cpu: 500m
+    memory: 512Mi
+
+probes:
+  liveness:
+    initialDelaySeconds: 20
+    periodSeconds: 10
+  readiness:
+    initialDelaySeconds: 5
+    periodSeconds: 5
+    failureThreshold: 3
+
+service:
+  type: ClusterIP
+  port: 8000
+
+ingress:
+  enabled: true
+  host: __APP_NAME__-__TENANT_ID_NODASHES__.apps.coralware.cloud
+  tlsSecretName: __APP_NAME__-tls
+
+alembic:
+  enabled: true
+  command: ["alembic", "upgrade", "head"]
+  resources:
+    requests: {cpu: 50m, memory: 128Mi}
+    limits:   {cpu: 200m, memory: 256Mi}
+
+serviceMonitor:
+  enabled: true
+  interval: 30s
+  port: http
+
+networkPolicy:
+  enabled: true
+  addonsNamespace: __TENANT_ID_NODASHES__-addons