feat(agent): let users choose model route

src/app/settings/assistant-actions.ts

@@ -9,9 +9,15 @@ import {
   MAX_ASSISTANT_NAME_LENGTH,
   MAX_ASSISTANT_SYSTEM_PROMPT_LENGTH,
 } from "@/lib/assistant-config";
-import { isValidLlmModelId, listLlmModels } from "@/lib/llm/models";
+import {
+  isValidAssistantModelRoute,
+  isValidLlmModelId,
+  listLlmModels,
+  type AssistantModelRoute,
+} from "@/lib/llm/models";
 import { users } from "@/modules/_core/schema";
 import { getCurrentSession } from "@/lib/session";
+import { getAssistantPreferences } from "@/lib/assistant-preference";
 
 const assistantNameSchema = z
   .string()
@@ -51,6 +57,19 @@ export async function setAssistantSystemPrompt(prompt: string | null): Promise<v
   revalidateAssistantSurfaces();
 }
 
+export async function setAssistantModelRoute(route: AssistantModelRoute): Promise<void> {
+  if (!isValidAssistantModelRoute(route)) {
+    throw new Error("Invalid assistant model route");
+  }
+
+  const { user } = await getCurrentSession();
+  await db
+    .update(users)
+    .set({ assistantModelRoute: route, assistantModel: null })
+    .where(eq(users.id, user.id));
+  revalidateAssistantSurfaces();
+}
+
 export async function setAssistantModel(model: string | null): Promise<void> {
   const { user } = await getCurrentSession();
   const normalized = model?.trim() || null;
@@ -59,7 +78,8 @@ export async function setAssistantModel(model: string | null): Promise<void> {
     throw new Error("Invalid assistant model");
   }
 
-  const available = await listLlmModels();
+  const assistant = await getAssistantPreferences(user.id);
+  const available = await listLlmModels({ route: assistant.modelRoute });
   const requested = normalized === available.fallbackModel ? null : normalized;
 
   if (requested !== null && !available.models.some((option) => option.id === requested)) {