fix: disable jpeg_avif_enabled in optimizer config (libsvtav1 unavailable on CI runners)

Agent-Logs-Url: https://github.com/winnerspiros/osu/sessions/1e430bc2-0512-43d3-8f3d-6bea53471ae6

Co-authored-by: winnerspiros <1675249+winnerspiros@users.noreply.github.com>

Author: Copilot

.github/resource-optimizer/config.json

@@ -19,7 +19,7 @@
   "png_webp_lossy_method": 6,
   "jpeg_webp_quality": 88,
   "jpeg_webp_method": 6,
-  "jpeg_avif_enabled": true,
+  "jpeg_avif_enabled": false,
   "jpeg_avif_crf": 30,
   "jpeg_avif_preset": 4,
   "audio_codec": "libopus",