feat: implement persistent audit logging for import/export operations with Prometheus metrics

main.py

@@ -20,6 +20,7 @@ from routes.imports import router as imports_router
 from routes.exports import router as exports_router
 from routes.projects import router as projects_router
 from routes.scenarios import router as scenarios_router
+from monitoring import router as monitoring_router
 from services.bootstrap import bootstrap_admin
 
 # Initialize database schema (imports above ensure models are registered)
@@ -67,5 +68,6 @@ app.include_router(imports_router)
 app.include_router(exports_router)
 app.include_router(projects_router)
 app.include_router(scenarios_router)
+app.include_router(monitoring_router)
 
 app.mount("/static", StaticFiles(directory="static"), name="static")