Add unit tests for station service and enhance documentation

- Introduced unit tests for the station service, covering creation, updating, and archiving of stations.
- Added detailed building block view documentation outlining the architecture of the Rail Game system.
- Created runtime view documentation illustrating key user interactions and system behavior.
- Developed concepts documentation detailing domain models, architectural patterns, and security considerations.
- Updated architecture documentation to reference new detailed sections for building block and runtime views.

backend/app/api/__init__.py

@@ -3,8 +3,10 @@ from fastapi import APIRouter
 from backend.app.api.auth import router as auth_router
 from backend.app.api.health import router as health_router
 from backend.app.api.network import router as network_router
+from backend.app.api.stations import router as stations_router
 
 router = APIRouter()
 router.include_router(health_router, tags=["health"])
 router.include_router(auth_router)
 router.include_router(network_router)
+router.include_router(stations_router)