Add admin user management

app/main.py

@@ -6,6 +6,7 @@ from fastapi.middleware.cors import CORSMiddleware
 from app.api.health import router as health_router
 from app.api.portfolios import router as portfolio_router
 from app.api.strategy_sets import router as strategy_sets_router
+from app.api.users import router as users_router
 from app.core.config import get_settings
 from app.core.errors import register_exception_handlers
 
@@ -30,6 +31,7 @@ def create_app() -> FastAPI:
     app.include_router(health_router)
     app.include_router(portfolio_router)
     app.include_router(strategy_sets_router)
+    app.include_router(users_router)
     register_exception_handlers(app)
     return app