Fix R2 subdomain URL for tia bucket

src/app/api/upload/route.ts

@@ -12,15 +12,20 @@ function getR2() {
     throw new Error(`Missing R2 config`);
   }
 
-  // R2 uses path-style: https://<accountId>.r2.cloudflarestorage.com/<bucket>
+  // Bucket is at subdomain: tia.<accountId>.r2.cloudflarestorage.com
+  // Or path: <accountId>.r2.cloudflarestorage.com/tia
+  const endpoint = bucket === "tia"
+    ? `https://${bucket}.${accountId}.r2.cloudflarestorage.com`
+    : `https://${accountId}.r2.cloudflarestorage.com/${bucket}`;
+
   return {
     client: new S3Client({
       region: "auto",
-      endpoint: `https://${accountId}.r2.cloudflarestorage.com`,
+      endpoint,
       credentials: { accessKeyId, secretAccessKey: secretKey },
     }),
     bucket,
-    baseUrl: `https://${accountId}.r2.cloudflarestorage.com/${bucket}`,
+    baseUrl: endpoint,
   };
 }