chore: optimize LCP images, fix Turbopack warning, update mock images

lib/openinary.ts

@@ -0,0 +1,19 @@
+export async function uploadToOpeninary(file: File, folder: string) {
+    const formData = new FormData();
+    formData.append("files", file);
+    formData.append("folder", folder);
+
+    const res = await fetch(`${process.env.OPENINARY_API_URL}/api/upload`, {
+        method: "POST",
+        headers: { Authorization: `Bearer ${process.env.OPENINARY_API_KEY}` },
+        body: formData,
+    });
+
+    if (!res.ok) {
+        const errorText = await res.text();
+        console.error("Openinary upload error:", errorText);
+        throw new Error("Upload başarısız: " + errorText);
+    }
+    const data = await res.json();
+    return data.files[0]; // { path, url, size, ... }
+}