Exclude spaces package from requirements.txt

The spaces package is pre-installed and pinned in HF Space
environments. Including it in requirements.txt can cause
version conflicts during pip install.

requirements.txt

@@ -1,5 +1,5 @@
 # This file was autogenerated by uv via the following command:
-#    uv export --no-hashes --no-dev --group hf-spaces --no-emit-package typer-slim -o requirements.txt
+#    uv export --no-hashes --no-dev --group hf-spaces --no-emit-package typer-slim --no-emit-package spaces -o requirements.txt
 aiofiles==24.1.0
     # via gradio
 aiohappyeyeballs==2.6.1
@@ -245,8 +245,6 @@ shellingham==1.5.4
     # via typer
 six==1.17.0
     # via python-dateutil
-spaces==0.48.0
-    # via detection-viewer-demo
 starlette==0.52.1
     # via
     #   fastapi