fix(build): 所有子脚本去掉set -euo pipefail + 全面容错

- install_prebuilt_corex.sh: set -euo pipefail → set +e, exit 2 → 非致命warning
- build_moe_topk.sh: set -euo pipefail → set +e
- patch_ops.sh: install_prebuilt_corex.sh 调用加 || echo non-fatal

26e6cb40没有这些子脚本。新增的子脚本用了set -euo pipefail会在
竞赛平台环境差异下（无GPU/权限不同/路径不同）触发exit非零，
虽然patch_ops.sh没set -e不会退出，但子进程的strict模式
可能导致意外的级联失败。

qwen3_6_scripts/patch_ops.sh

@@ -205,7 +205,7 @@ build_stage "skipping vLLM core block overrides (vendor_overrides not found)"
 fi
 
 build_stage "installing hash-pinned CoreX 3.2.3 extensions"
-bash ./install_prebuilt_corex.sh "${VLLM_ROOT}"
+bash ./install_prebuilt_corex.sh "${VLLM_ROOT}" || echo "[WARN] install_prebuilt_corex failed (non-fatal)"
 
 build_stage "compiling moe_topk_softmax CUDA kernel"
 cd /workspace && bash ex_engine/build_moe_topk.sh 2>&1 || echo "[WARN] moe_topk build failed (non-fatal)"