perf: cut cold route compilation and unblock preview images (#6441)

packages/api/src/rsc-context.ts

@@ -0,0 +1,16 @@
+import { cache } from "react";
+import { headers } from "next/headers";
+
+import { auth } from "@homarr/auth/next";
+
+import { createTRPCContext } from "./trpc";
+
+export const createRscTrpcContext = cache(async () => {
+  const requestHeaders = new Headers(await headers());
+  requestHeaders.set("x-trpc-source", "rsc");
+
+  return createTRPCContext({
+    session: await auth(),
+    headers: requestHeaders,
+  });
+});