Add multi-GPU support and HTML test interface

- Update SageAttention CUDA arch list to support A100, A10, RTX 4090, L40, H100/H200
- Add interactive HTML test page for RunPod API testing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -65,9 +65,10 @@ WORKDIR /tmp
 ENV EXT_PARALLEL=2
 ENV NVCC_APPEND_FLAGS="--threads 2"
 ENV MAX_JOBS=4
-# Target RunPod GPU architectures: H100/H200(9.0)
+# Target RunPod GPU architectures:
+# 8.0 = A100, 8.6 = A10/RTX 3090, 8.9 = RTX 4090/L40, 9.0 = H100/H200
 # Note: Blackwell (10.0) not yet supported by SageAttention
-ENV TORCH_CUDA_ARCH_LIST="9.0"
+ENV TORCH_CUDA_ARCH_LIST="8.0;8.6;8.9;9.0"
 RUN git clone https://github.com/thu-ml/SageAttention.git && \
     cd SageAttention && \
     pip install --no-build-isolation . && \