fix(tpc): Mod.Var 链属性访问补第四条类回退（直读 var_/global_struct_class）

lib/core/Handles/HandlesExprAttr.py

@@ -805,6 +805,34 @@ class ExprAttrHandle(BaseHandle):
                 AttrClassName = self._get_attr_class(Node.value, Gen)
             if not AttrClassName:
                 AttrClassName = self._resolve_attr_parent_hint(Node.value, Gen)
+            if not AttrClassName:
+                # 【模块别名 + 模块级变量】`Mod.Var` 形态（如 CompilerFactory.factory）：
+                # 上面三个解析器都按「字段所属类」思路找，对「模块别名.变量」返回 None
+                # （[CHAIN-DBG] char* key-miss: attr_class=None，StructGenMixin.vp:139 与
+                # ClassGenVTable.vp:99 根因）。而该变量的类已由 HandlesImports 的
+                # _EmitExternalGlobalDeclLlvm / HandlesAnnAssign 登记在
+                # var_struct_class / global_struct_class（键为**裸变量名**）⇒ 直读。
+                _mva: ast.AST | None = Node.value
+                if isinstance(_mva, ast.Attribute) and isinstance(_mva.value, ast.Name):
+                    _mname: str = _mva.value.id
+                    _sha1_map2 = getattr(Gen, 'ModuleSha1Map', {}) or {}
+                    _imported2 = getattr(self.Trans, '_ImportedModules', None) or []
+                    _aliases2 = getattr(self.Trans.SymbolTable, 'import_aliases', {}) or {}
+                    try:
+                        _rmod: str = self.Trans.SymbolTable.resolve_alias(_mname)
+                    except Exception:
+                        _rmod = _mname
+                    _is_mod2: bool = (_mname in _sha1_map2 or _rmod in _sha1_map2
+                                      or _mname in _imported2 or _rmod in _imported2
+                                      or _mname in _aliases2 or _rmod in _aliases2)
+                    if not _is_mod2:
+                        for _k2 in _sha1_map2:
+                            if _k2 == _mname or _k2.endswith(f'.{_mname}'):
+                                _is_mod2 = True
+                                break
+                    if _is_mod2:
+                        AttrClassName = (getattr(Gen, 'var_struct_class', {}).get(_mva.attr)
+                                         or getattr(Gen, 'global_struct_class', {}).get(_mva.attr))
             ResolvedKey: str | None = self._find_struct_key_for_class_hint(Gen, AttrClassName)
             if ResolvedKey is None or ResolvedKey not in Gen.structs:
                 import sys as _sys2