Fix oauthhub image path and update authors

Changed image extension from .png to .jpg to match actual file, added missing author, and added photos directory.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: haojian

public/photos/oauthhub.jpg

@@ -20,10 +20,10 @@ export const publications: Publication[] = [
     id: "oauthhub",
     shorttitle: "oauthhub",
     title: "OAuthHub: Mitigating OAuth Data Overaccess through a Local Data Hub",
-    authors: "qiyu li, haojian jin",
+    authors: "qiyu li, yuhe tian, haojian jin",
     venue: "pets'26",
     year: 2026,
-    image: "https://www.haojianj.in/resource/image/arkinator.jpg",
+    image: "photos/oauthhub.jpg",
     links: [{ label: "paper", url: "#" }],
     category: "conference",
     tags: ["privacy", "ai systems"],