debug(gen): 一次性插桩打印 Generator.FuncGenBase 字段查找上下文（用完删除）

AsyncGenMixin.vp:58 `self.Gen.FuncGenBase` 报「属性访问失败」，需确认
lookup_field 收到的 struct_ty 是谁、结构体表里 Generator 条目的 FieldCount/sha1，
以判断是字段缺失、Ty 身份不一致还是按到了空/错误条目。仅打印，不改行为。

App/lib/core/Gen/StructGenMixin.vp

@@ -1304,6 +1304,26 @@ novirtual class StructGenMixin:
         if struct_ty is None or field_name is None or self.StructTable is None:
             return None
 
+        # [DBG-GEN] 一次性诊断（定位 Generator.FuncGenBase 字段查找失败，用完删除）
+        if string.strcmp(field_name, "FuncGenBase") == 0:
+            _dg_ty: str = self._extract_struct_name(struct_ty)
+            _dg_ty_t: str = "<non-struct>"
+            if _dg_ty is not None:
+                _dg_ty_t = _dg_ty
+            stdio.printf("[DBG-GEN] lookup 'FuncGenBase' struct_ty=%s\n", _dg_ty_t)
+            _dg_i: int = 0
+            while _dg_i < self.StructCount:
+                _dg_e: GenTypes.StructEntry* = self._get_struct_entry(_dg_i)
+                if _dg_e is not None and _dg_e.Name is not None:
+                    if string.strstr(_dg_e.Name, "Generator") is not None:
+                        _dg_sh: str = _dg_e.ModuleSha1
+                        _dg_sh_t: str = "<null>"
+                        if _dg_sh is not None:
+                            _dg_sh_t = _dg_sh
+                        stdio.printf("[DBG-GEN] tbl[%d] name=%s fcount=%d sha1=%s\n",
+                                     _dg_i, _dg_e.Name, _dg_e.FieldCount, _dg_sh_t)
+                _dg_i += 1
+
         # ============================================================
         # 两遍查找策略（跨模块同名类冲突的根本修复）:
         #