refactor and reorganize

src/lib/api/cookies.ts

@@ -0,0 +1,12 @@
+import { cookies } from "next/headers";
+
+export async function authCookieHeader() {
+    const allCookies = await cookies();
+    const cookieName = process.env.SESSION_COOKIE_NAME!;
+    const sessionId = allCookies.get(cookieName)?.value ?? null;
+    return {
+        headers: {
+            Cookie: `${cookieName}=${sessionId}`,
+        },
+    };
+}