feat(fase4): add FlowTemplate model and API

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/api-gateway/app/main.py

@@ -2,7 +2,7 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from app.core.config import get_settings
 from app.core.database import engine, Base
-from app.routers import auth, whatsapp, flows, queues, supervisor
+from app.routers import auth, whatsapp, flows, queues, supervisor, flow_templates
 
 settings = get_settings()
 
@@ -31,6 +31,7 @@ app.include_router(whatsapp.router)
 app.include_router(flows.router)
 app.include_router(queues.router)
 app.include_router(supervisor.router)
+app.include_router(flow_templates.router)
 
 
 @app.get("/health")