feat: integrate Cloudinary image upload, Instagram Feed, and fix Next.js warnings

lib/auth.ts

@@ -0,0 +1,44 @@
+import { SignJWT, jwtVerify } from 'jose';
+import { cookies } from 'next/headers';
+
+const secretKey = process.env.JWT_SECRET || 'fallback-secret-for-development-only-do-not-use-in-prod';
+const key = new TextEncoder().encode(secretKey);
+
+export async function signToken(payload: any) {
+  return await new SignJWT(payload)
+    .setProtectedHeader({ alg: 'HS256' })
+    .setIssuedAt()
+    .setExpirationTime('1d') // 1 günlük oturum süresi
+    .sign(key);
+}
+
+export async function verifyToken(token: string) {
+  try {
+    const { payload } = await jwtVerify(token, key);
+    return payload;
+  } catch (error) {
+    return null;
+  }
+}
+
+export async function setAuthCookie(token: string) {
+  const cookieStore = await cookies();
+  cookieStore.set('admin_token', token, {
+    httpOnly: true,
+    secure: process.env.NODE_ENV === 'production',
+    sameSite: 'lax',
+    maxAge: 60 * 60 * 24, // 1 day in seconds
+    path: '/',
+  });
+}
+
+export async function removeAuthCookie() {
+  const cookieStore = await cookies();
+  cookieStore.delete('admin_token');
+}
+
+export async function getAuthCookie() {
+  const cookieStore = await cookies();
+  const token = cookieStore.get('admin_token')?.value;
+  return token ? await verifyToken(token) : null;
+}