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).

code/app/main.py

@@ -0,0 +1,94 @@
+"""
+Aplicación FastAPI — entry point.
+
+Endpoints obligatorios del shape rest-api/python (ver coralware-shape.yaml):
+- /health   → liveness + readiness (siempre 200 si el proceso está vivo)
+- /docs     → Swagger UI (auth opcional)
+- /metrics  → Prometheus
+
+Endpoints de dominio: agregar en app/routers/ y registrar en _register_routers().
+"""
+
+import logging
+
+from fastapi import Depends, FastAPI, HTTPException, Request, status
+from fastapi.responses import JSONResponse, Response
+from prometheus_client import CONTENT_TYPE_LATEST, generate_latest
+
+from app.settings import settings
+
+logging.basicConfig(
+    level=getattr(logging, settings.LOG_LEVEL, logging.INFO),
+    format="%(asctime)s [%(levelname)s] [cid=%(correlation_id)s] %(message)s",
+    datefmt="%Y-%m-%dT%H:%M:%SZ",
+)
+
+
+class CorrelationIdFilter(logging.Filter):
+    def filter(self, record: logging.LogRecord) -> bool:
+        if not hasattr(record, "correlation_id"):
+            record.correlation_id = "-"
+        return True
+
+
+logging.getLogger().addFilter(CorrelationIdFilter())
+log = logging.getLogger("__APP_NAME__")
+
+
+def _require_auth_dep() -> None:
+    """
+    Dependency placeholder para /docs cuando OPENAPI_REQUIRE_AUTH=true.
+    Implementación real: validar JWT contra KEYCLOAK_ISSUER (ADR-029 R-004).
+    """
+    if not settings.OPENAPI_REQUIRE_AUTH:
+        return
+    raise HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Auth requerido — implementar validación JWT contra Keycloak",
+    )
+
+
+def create_app() -> FastAPI:
+    app = FastAPI(
+        title="__APP_NAME__",
+        version="0.1.0",
+        dependencies=[Depends(_require_auth_dep)] if settings.OPENAPI_REQUIRE_AUTH else [],
+    )
+
+    @app.middleware("http")
+    async def correlation_id_middleware(request: Request, call_next):
+        cid = request.headers.get(settings.CORRELATION_ID_HEADER) or _generate_cid()
+        request.state.correlation_id = cid
+        response = await call_next(request)
+        response.headers[settings.CORRELATION_ID_HEADER] = cid
+        return response
+
+    @app.get("/health", tags=["platform"])
+    async def health() -> JSONResponse:
+        return JSONResponse(status_code=200, content={"status": "ok"})
+
+    @app.get("/metrics", tags=["platform"])
+    async def metrics() -> Response:
+        return Response(content=generate_latest(), media_type=CONTENT_TYPE_LATEST)
+
+    _register_routers(app)
+    return app
+
+
+def _generate_cid() -> str:
+    """Genera correlation_id si el cliente no envió uno."""
+    import time
+    import uuid
+
+    return f"__APP_NAME__-{int(time.time() * 1000)}-{uuid.uuid4().hex[:8]}"
+
+
+def _register_routers(app: FastAPI) -> None:
+    """
+    Registra los routers de dominio.
+    Agrega aquí los include_router(...) conforme tu app crezca.
+    """
+    pass
+
+
+app = create_app()