Pin sdk_version to 5.49.1 to match gradio requirement

Without sdk_version, HF injected gradio 6.15.2 which conflicted
with the gradio==5.49.1 pin in requirements.txt. Pin the Space SDK
version so HF installs the matching gradio build.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -5,6 +5,7 @@ colorFrom: blue
 colorTo: purple
 short_description: Single Image 3D Face Reconstruction with Gaussian Splatting
 sdk: gradio
+sdk_version: 5.49.1
 app_file: app.py
 pinned: false
 ---