feat: poblar scaffold inicial del shape rest-api/python

Reemplaza el placeholder mínimo previo por el scaffold canónico del
golden path rest-api/python (entry point para tier free-trial):

- code/app/main.py — FastAPI con /health (sin DB), /metrics, middleware
  correlation_id, settings Pydantic
- code/tests/ — pytest + httpx TestClient (sin testcontainers, sin Docker)
- helm/APP_NAME/ — chart minimal: Deployment, Service, IngressRoute,
  NetworkPolicy. SIN Job Alembic, SIN ServiceMonitor, SIN claim de BD
- coralware-shape.yaml — shapeVersion 1.0.0, minTier free-trial,
  promotionPath -> web-backend-python cuando se requiera persistencia
- .gitea/workflows/APP_NAME-build.yaml — invoca reusable workflow ADR-038
  + job helm-deploy con KUBECONFIG_TENANT_B64

Diferencias con web-backend/python: sin alembic, sin BD, sin
testcontainers, NetworkPolicy sin acceso a ns-addons.

Placeholders __APP_NAME__, __TIER__, __TENANT_ID__, __TENANT_ID_NODASHES__
serán sustituidos server-side por repo-provisioner.

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

Refs: ADR-027 (Golden Paths), ADR-038 (CI), ADR-053 (referencia anatomía).

helm/APP_NAME/templates/networkpolicy.yaml

@@ -0,0 +1,57 @@
+{{- if .Values.networkPolicy.enabled }}
+# NetworkPolicy mínima del shape rest-api: bajo deny-all-default del namespace, permite:
+# - Ingress: Traefik (público) + Prometheus (scrape de /metrics).
+# - Egress: DNS, Harbor pull HTTPS.
+# Sin acceso a ns-addons (rest-api no tiene BD por diseño).
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    {{- include "app.labels" . | nindent 4 }}
+spec:
+  podSelector:
+    matchLabels:
+      {{- include "app.selectorLabels" . | nindent 6 }}
+  policyTypes: [Ingress, Egress]
+
+  ingress:
+    # Tráfico HTTP desde Traefik (IngressRoute)
+    - from:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: traefik-system
+      ports:
+        - protocol: TCP
+          port: 8000
+    # Scrape de métricas Prometheus
+    - from:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: cattle-monitoring-system
+          podSelector:
+            matchLabels:
+              app.kubernetes.io/name: prometheus
+      ports:
+        - protocol: TCP
+          port: 8000
+
+  egress:
+    # DNS
+    - to:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: kube-system
+      ports:
+        - protocol: UDP
+          port: 53
+        - protocol: TCP
+          port: 53
+    # Harbor pull (registro de imágenes) — HTTPS abierto
+    - to:
+        - ipBlock:
+            cidr: 0.0.0.0/0
+      ports:
+        - protocol: TCP
+          port: 443
+{{- end }}