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。

qwen3_6_scripts/bi100_env.py

@@ -1,26 +0,0 @@
-import os
-
-
-def env_bool(name: str, default: bool = False) -> bool:
-    raw = os.getenv(name)
-    if raw is None:
-        return default
-    if raw in ("1", "true", "True", "yes", "YES", "on", "ON"):
-        return True
-    if raw in ("0", "false", "False", "no", "NO", "off", "OFF"):
-        return False
-    raise RuntimeError(f"{name} must be boolean, got {raw!r}")
-
-
-def env_int(name: str, default: int, min_value: int, max_value: int) -> int:
-    raw = os.getenv(name)
-    if raw is None:
-        return default
-    try:
-        value = int(raw)
-    except ValueError as exc:
-        raise RuntimeError(f"{name} must be int, got {raw!r}") from exc
-    if not (min_value <= value <= max_value):
-        raise RuntimeError(
-            f"{name}={value} outside [{min_value}, {max_value}]")
-    return value