feat(nccl): add nccl-tests all_reduce_perf for GPU bandwidth testing

- Dockerfile: install cuda-nvcc-13-0 from NVIDIA repo for compilation
- build-nccl-tests.sh: downloads libnccl-dev for nccl.h, builds all_reduce_perf
- build.sh: runs nccl-tests build, injects binary into /usr/local/bin/
- platform: RunNCCLTests() auto-detects GPU count, runs all_reduce_perf
- TUI: NCCL bandwidth test entry in Burn-in Tests screen [N] hotkey

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

iso/builder/build.sh

@@ -197,7 +197,8 @@ rm -f \
     "${OVERLAY_STAGE_DIR}/root/.ssh/authorized_keys" \
     "${OVERLAY_STAGE_DIR}/usr/local/bin/bee" \
     "${OVERLAY_STAGE_DIR}/usr/local/bin/bee-gpu-stress" \
-    "${OVERLAY_STAGE_DIR}/usr/local/bin/bee-smoketest"
+    "${OVERLAY_STAGE_DIR}/usr/local/bin/bee-smoketest" \
+    "${OVERLAY_STAGE_DIR}/usr/local/bin/all_reduce_perf"
 
 # --- inject authorized_keys for SSH access ---
 AUTHORIZED_KEYS_FILE="${OVERLAY_STAGE_DIR}/root/.ssh/authorized_keys"
@@ -298,6 +299,20 @@ echo "=== NCCL: $(ls "${NCCL_CACHE}/lib/" | wc -l) files injected into /usr/lib/
 cp "${CUBLAS_CACHE}/lib/"* "${OVERLAY_STAGE_DIR}/usr/lib/"
 echo "=== cuBLAS: $(ls "${CUBLAS_CACHE}/lib/" | wc -l) files injected into /usr/lib/ ==="
 
+# --- build nccl-tests ---
+echo ""
+echo "=== building nccl-tests ${NCCL_TESTS_VERSION} ==="
+sh "${BUILDER_DIR}/build-nccl-tests.sh" \
+    "${NCCL_TESTS_VERSION}" \
+    "${NCCL_VERSION}" \
+    "${NCCL_CUDA_VERSION}" \
+    "${DIST_DIR}"
+
+NCCL_TESTS_CACHE="${DIST_DIR}/nccl-tests-${NCCL_TESTS_VERSION}"
+cp "${NCCL_TESTS_CACHE}/bin/all_reduce_perf" "${OVERLAY_STAGE_DIR}/usr/local/bin/all_reduce_perf"
+chmod +x "${OVERLAY_STAGE_DIR}/usr/local/bin/all_reduce_perf"
+echo "=== all_reduce_perf injected ==="
+
 # --- embed build metadata ---
 mkdir -p "${OVERLAY_STAGE_DIR}/etc"
 BUILD_DATE="$(date +%Y-%m-%d)"
@@ -314,6 +329,7 @@ NCCL_VERSION=${NCCL_VERSION}
 NCCL_CUDA_VERSION=${NCCL_CUDA_VERSION}
 CUBLAS_VERSION=${CUBLAS_VERSION}
 CUDA_USERSPACE_VERSION=${CUDA_USERSPACE_VERSION}
+NCCL_TESTS_VERSION=${NCCL_TESTS_VERSION}
 EOF
 
 # Patch motd with build info