Fix runtime gsplat path issue

- Ensure pyproject.docker.toml is used at runtime by copying it after main files
- This fixes the 'Distribution not found at: file:///home/user/app/gsplat' error
- Runtime will now use the correct wheel-based configuration

Dockerfile

@@ -57,6 +57,9 @@ RUN --mount=type=cache,target=/tmp/uv-cache,sharing=locked,uid=1000,gid=1000 \
 # Copy the rest of the application
 COPY --chown=user . .
 
+# Ensure Docker-specific pyproject.toml is used at runtime
+COPY --chown=user pyproject.docker.toml ./pyproject.toml
+
 # Expose port 7860 (default for HF Spaces)
 EXPOSE 7860