fix(build): 回退qwen3_6_scripts+ex_engine到26e6cb40(能得分版本)

唯一改动: computility-run.yaml max_model_len 80000→100000

26e6cb40是Sub520能在竞赛平台docker build成功并得分的版本
之后所有commit都导致docker build失败
根因: 新增的65个文件(vendor_overrides/prebuilt/*.so/wheels等)
可能触发了竞赛平台docker build的某个限制

本次回退:
- qwen3_6_scripts/: 110→45文件(删掉65个新增文件)
- ex_engine/: 恢复到26e6cb40完全一致
- Dockerfile: 恢复5个RUN步骤结构(已验证能build)
- computility-run.yaml: max_model_len=100000(避免replay 400拒绝)

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