feat: refine configurable header and branding

apps/nextjs/src/app/api/assistant/chat/route.ts

@@ -18,7 +18,6 @@ import { decryptSecret } from "@homarr/common/server";
 import { createLogger } from "@homarr/core/infrastructure/logs";
 import { and, eq } from "@homarr/db";
 import { db } from "@homarr/db";
-import { getServerSettingByKeyAsync } from "@homarr/db/queries";
 import { assistantConfigurations, assistantThreads } from "@homarr/db/schema";
 import {
   assistantProviderCanUseOpenRouterServerTools,
@@ -374,11 +373,6 @@ export async function POST(request: Request) {
     return Response.json({ error: "Sign in to use Assistant." }, { status: 401 });
   }
 
-  const featureControls = await getServerSettingByKeyAsync(db, "featureControls");
-  if (!featureControls.assistantEnabled) {
-    return Response.json({ error: "Assistant is disabled." }, { status: 404 });
-  }
-
   const requestBody = await request.text();
   if (requestBody.length > assistantRequestMaxBytes) {
     return Response.json({ error: "The assistant request is too large." }, { status: 413 });