Revert "fix(CRITICAL): 极简防弹Dockerfile——每个RUN都 || true"

This reverts commit a8acfbbb8f.

ex_engine/python/__init__.py

@@ -1,16 +1,3 @@
 from .ex_loader import EXEngine, get_engine
 
 __all__ = ["EXEngine", "get_engine"]
-
-# Lazy imports for new modules (don't break if deps missing)
-def __getattr__(name):
-    if name == "ix":
-        from .ix_unified import ix
-        return ix
-    if name == "gdn_fp32":
-        from . import gdn_fp32
-        return gdn_fp32
-    if name == "moe_dispatch":
-        from . import moe_dispatch
-        return moe_dispatch
-    raise AttributeError(f"module 'ex_engine.python' has no attribute {name}")