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/templates/deployment.yaml

@@ -0,0 +1,87 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    {{- include "app.labels" . | nindent 4 }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      {{- include "app.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      labels:
+        {{- include "app.labels" . | nindent 8 }}
+      annotations:
+        checksum/db-secret: {{ include "app.dbSecretChecksum" . }}
+    spec:
+      serviceAccountName: {{ .Release.Name }}
+      imagePullSecrets:
+        - name: {{ .Values.image.pullSecret }}
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 1001
+        seccompProfile:
+          type: RuntimeDefault
+      containers:
+        - name: app
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - name: http
+              containerPort: 8000
+              protocol: TCP
+          envFrom:
+            - secretRef:
+                name: {{ .Values.database.secretName }}
+            - configMapRef:
+                name: {{ .Release.Name }}-config
+          env:
+            - name: STATIC_DEMO_PATH
+              value: {{ .Values.config.staticDemoPath | quote }}
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: http
+            initialDelaySeconds: {{ .Values.probes.liveness.initialDelaySeconds }}
+            periodSeconds: {{ .Values.probes.liveness.periodSeconds }}
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: http
+            initialDelaySeconds: {{ .Values.probes.readiness.initialDelaySeconds }}
+            periodSeconds: {{ .Values.probes.readiness.periodSeconds }}
+            failureThreshold: {{ .Values.probes.readiness.failureThreshold }}
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+          securityContext:
+            allowPrivilegeEscalation: false
+            readOnlyRootFilesystem: true
+            capabilities:
+              drop: ["ALL"]
+          volumeMounts:
+            - name: tmp
+              mountPath: /tmp
+      volumes:
+        - name: tmp
+          emptyDir: {}
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    {{- include "app.labels" . | nindent 4 }}
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ .Release.Name }}-config
+  labels:
+    {{- include "app.labels" . | nindent 4 }}
+data:
+  LOG_LEVEL: {{ .Values.config.logLevel | quote }}
+  CORRELATION_ID_HEADER: {{ .Values.config.correlationIdHeader | quote }}
+  OPENAPI_REQUIRE_AUTH: {{ .Values.config.openapiRequireAuth | quote }}
+  KEYCLOAK_ISSUER: {{ .Values.config.keycloakIssuer | quote }}