fix: ex_engine.python subpackage + flash_qla_sm70 deploy + vllm v0.5.5 MoE kernels

真机验证发现的问题:
1. qwen3_5.py 做 'from ex_engine.python.ix_bridge' 但包结构是 ex_engine.ix_bridge
   → 创建 python/ 子目录 + symlinks
2. flash_qla_sm70 只部署到 /workspace 没有到 vllm models 目录
   → 显式 cp -r 到 VLLM/model_executor/models/
3. 从 vllm v0.5.5 搬 MoE CUDA kernels (torch::Tensor API):
   - topk_softmax_kernels.cu (506行, CUB BlockReduce)
   - moe_align_block_size_kernels.cu (134行)
   - moe_pybind.cpp (pybind11 入口)

真机验证结果:
  ✓ ix_bridge import OK, available=True
  ✓ topk_softmax (64 experts, top8) OK — CUDA kernel 命中
  ✓ ix_full_bridge silu_and_mul OK
  ✓ qwen3_5.py import OK
  ✓ ex_engine build 2/2 factors
  ✓ moe_topk_softmax_v3.so 编译成功
  ✓ flash_qla_sm70_gdn_strided.so 编译成功
  ✗ 单卡 32GB OOM (正常, 竞赛 4卡 tp=4)

qwen3_6_scripts/patch_ops.sh

@@ -143,4 +143,27 @@ cp ./_custom_ops.py "$VLLM/_custom_ops.py" 2>/dev/null && \
     echo "[patch_ops] _custom_ops.py deployed" || true
 [ -n "$VLLM2" ] && cp ./_custom_ops.py "$VLLM2/_custom_ops.py" 2>/dev/null || true
 
+# ---- 6. ex_engine.python subpackage (qwen3_5.py does "from ex_engine.python.ix_bridge") ----
+# The flat ex_engine package has ix_bridge.py at top level, but qwen3_5.py imports from .python subdir
+_EX_PKG=$(python3 -c "import ex_engine; import os; print(os.path.dirname(ex_engine.__file__))" 2>/dev/null)
+if [ -n "$_EX_PKG" ] && [ -d "$_EX_PKG" ]; then
+    mkdir -p "$_EX_PKG/python"
+    touch "$_EX_PKG/python/__init__.py"
+    for f in ix_bridge.py corex_moe.py corex_gdn.py corex_fa2.py; do
+        [ -f "$_EX_PKG/$f" ] && ln -sf "$_EX_PKG/$f" "$_EX_PKG/python/$f"
+    done
+    echo "[patch_ops] ex_engine.python subpackage linked"
+fi
+
+# ---- 7. flash_qla_sm70 deployment to BOTH vllm paths ----
+_FLASH_SRC="/workspace/qwen3_6_scripts/flash_qla_sm70"
+if [ -d "$_FLASH_SRC" ]; then
+    for _VPATH in "$VLLM" "$VLLM2"; do
+        [ -z "$_VPATH" ] && continue
+        _FLASH_DST="$_VPATH/model_executor/models/flash_qla_sm70"
+        cp -r "$_FLASH_SRC" "$_FLASH_DST" 2>/dev/null || true
+    done
+    echo "[patch_ops] flash_qla_sm70 deployed to vllm model dirs"
+fi
+
 echo "[patch_ops] DONE"