Add models and routes for costs, consumption, equipment, maintenance, and production; implement CRUD operations and unit tests

routes/ui.py

@@ -18,3 +18,9 @@ async def scenario_form(request: Request):
 async def parameter_form(request: Request):
     """Render the parameter input form."""
     return templates.TemplateResponse("ParameterInput.html", {"request": request})
+
+
+@router.get("/", response_class=HTMLResponse)
+async def dashboard(request: Request):
+    """Render the central dashboard page."""
+    return templates.TemplateResponse("Dashboard.html", {"request": request})