add oauth and create suggestion

src/server/routes/auth/github.get.ts

@@ -0,0 +1,18 @@
+export default oauth.githubEventHandler({
+  config: {
+    emailRequired: true,
+  },
+  async onSuccess(event: any, { user }: any) {
+    await setUserSession(event, {
+      user: {
+        email: user.email,
+        picture: user.avatar_url,
+        username: String(user.name).trim(),
+      },
+    })
+    return sendRedirect(event, '/')
+  },
+  onError(error: any) {
+    console.error('GitHub OAuth error:', error)
+  },
+})