test: 回退Docker context到26e6cb40完全一致——验证竞赛平台build

Dockerfile/qwen3_6_scripts/ex_engine/computility-run.yaml 全部
还原到26e6cb40的精确内容。删除所有26e6cb40不存在的新增文件
(prebuilt/*.so, wheels/*.whl, vendor_overrides/, 新增.cu/.sh等)。

目的：确认26e6cb40的文件内容在当前git状态下仍能通过竞赛平台build。
如果通过，说明问题在新增文件中；如果不通过，说明问题在git仓库层面。

ex_engine/build_moe_topk.sh

@@ -1,48 +0,0 @@
-#!/usr/bin/env bash
-# build_moe_topk.sh — Compile moe_topk_softmax_v3.cu into importable .so
-set +e
-cd "$(dirname "$0")"
-
-PYTHON=${PYTHON:-python3}
-TORCH_ROOT=$($PYTHON -c "import torch; import os; print(os.path.dirname(torch.__file__))")
-PY_INC=$($PYTHON -c "import sysconfig; print(sysconfig.get_path('include'))")
-PY_SUFFIX=$($PYTHON -c "import sysconfig; print(sysconfig.get_config_var('EXT_SUFFIX'))")
-TORCH_INC="${TORCH_ROOT}/include"
-TORCH_INC2="${TORCH_ROOT}/include/torch/csrc/api/include"
-TORCH_LIB="${TORCH_ROOT}/lib"
-
-for _CXX in /usr/local/corex/bin/clang++ g++; do
-    [ -x "$_CXX" ] && CXX="$_CXX" && break
-done
-
-mkdir -p build
-OUT="build/moe_topk_softmax_v3${PY_SUFFIX}"
-
-echo "[build] CXX=$CXX"
-echo "[build] Output: $OUT"
-
-$CXX -shared -fPIC -O2 -std=c++17 \
-    --cuda-gpu-arch=ivcore10 \
-    -I"$PY_INC" \
-    -I"$TORCH_INC" \
-    -I"$TORCH_INC2" \
-    -L"$TORCH_LIB" \
-    -ltorch -ltorch_cpu -ltorch_cuda -ltorch_python -lc10 -lc10_cuda \
-    -Wl,--no-as-needed,-rpath,"$TORCH_LIB" \
-    -D_GLIBCXX_USE_CXX11_ABI=0 \
-    -DTORCH_EXTENSION_NAME=moe_topk_softmax_v3 \
-    csrc/moe_topk_softmax_v3.cu \
-    -o "$OUT" 2>&1
-
-echo "[build] Size: $(du -h "$OUT" | cut -f1)"
-
-# Verify import + GPU test
-$PYTHON << PY
-import importlib.util, torch
-spec = importlib.util.spec_from_file_location("moe_topk_softmax_v3", "$OUT")
-mod = importlib.util.module_from_spec(spec)
-spec.loader.exec_module(mod)
-g = torch.randn(4, 64, device="cuda", dtype=torch.float16)
-w, ids, src = mod.moe_topk_softmax(g, 8, True)
-print(f"[verify] ✓ weights={w.shape} ids={ids.shape} sum={w.sum(-1).tolist()}")
-PY