Implement distribution management API and UI forms; add distribution model and tests

routes/ui.py

@@ -0,0 +1,20 @@
+from fastapi import APIRouter, Request
+from fastapi.responses import HTMLResponse
+from fastapi.templating import Jinja2Templates
+
+router = APIRouter()
+
+# Set up Jinja2 templates directory
+templates = Jinja2Templates(directory="templates")
+
+
+@router.get("/ui/scenarios", response_class=HTMLResponse)
+async def scenario_form(request: Request):
+    """Render the scenario creation form."""
+    return templates.TemplateResponse("ScenarioForm.html", {"request": request})
+
+
+@router.get("/ui/parameters", response_class=HTMLResponse)
+async def parameter_form(request: Request):
+    """Render the parameter input form."""
+    return templates.TemplateResponse("ParameterInput.html", {"request": request})