feat(agent): let users choose model route

drizzle/meta/_journal.json

@@ -183,6 +183,13 @@
       "when": 1783560000000,
       "tag": "0025_assistant_model",
       "breakpoints": true
+    },
+    {
+      "idx": 26,
+      "version": "7",
+      "when": 1783561000000,
+      "tag": "0026_assistant_model_route",
+      "breakpoints": true
     }
   ]
-}
+}