M5-T05: add Modbus JSON API (device CRUD, readings, metrics, test)

app/main.py

@@ -13,6 +13,7 @@ from sqlalchemy.orm import Session
 from app import models  # noqa: F401
 from app.api.routes.api.config import router as api_config_router
 from app.api.routes.api.data import router as api_data_router
+from app.api.routes.api.modbus import router as api_modbus_router
 from app.api.routes.api.session import router as api_session_router
 from app.api.routes import status
 from app.db import get_session_local
@@ -125,6 +126,7 @@ def create_app() -> FastAPI:
     app.include_router(status.router)
     app.include_router(api_config_router)
     app.include_router(api_data_router)
+    app.include_router(api_modbus_router)
     app.include_router(api_session_router)
     app.include_router(homeassistant_router)
     app.include_router(location_router)