feat: improve assistant background controls

apps/nextjs/src/components/assistant/assistant-preferences.ts

@@ -0,0 +1,7 @@
+export type { AssistantReasoningMode } from "@homarr/definitions";
+
+export type AssistantRuntimeModelOption = {
+  id: string;
+  name: string;
+  inputModalities: string[];
+};