style(gateway): biome format fix for imageResizer (unblock CI gate)

imageResizer.ts had a line exceeding the print width that biome flagged
as a formatter error, failing the Build & Deploy biome check. Re-format
the file. No logic change.

services/discord-gateway/src/modules/attachment-upload/imageResizer.ts

@@ -43,7 +43,9 @@ export async function resizeImageForVision(
         originalSize: buf.length,
         originalFormat: inputFormat,
         resizedSize: resized.length,
-        reductionPct: Math.round(((buf.length - resized.length) / buf.length) * 100),
+        reductionPct: Math.round(
+          ((buf.length - resized.length) / buf.length) * 100,
+        ),
       },
       "Image resized for vision analysis (JPEG)",
     );