refactor(tpv): 删除 Handles 目录，核心逻辑合并进 Gen

- 新建 Gen/Translator.vp：Translator 类 + Mixin + 常量 + _mbuddy 自 HandlesTranslator 迁入（删 7 个委托壳与 _g_gen）

- GenApi 下沉 7 个 global/nonlocal 管理委托（add/is_global_name、add/is_nonlocal_name、get_nonlocal_type/index、clear_scope_names）+ update_global_func_typestr

- CallGenLeafKit 并入 ExprCallHandle 类，NewExprCallHandle 改本地引用

- 删除 Handles/HandlesExpr/ExprCallTable/HandlesBase（60+ 委托零消费者/纯委托壳）与 Handles 目录整体

- 全 App 56 文件 import 改指 lib.core.Gen.*，清理死 import，委托调用改 GenApi，main/BuildPipeline _g_gen 注入删除

App/lib/core/Gen/Call/CallGenVt.vp

@@ -13,11 +13,8 @@ import sys
 import viperlib
 import w32.fileio as fileio
 import lib.core.VLogger as VLogger
-import lib.core.Handles.HandlesBase as HandlesBase
-import lib.core.Handles.HandlesTranslator as HT
-import lib.core.Handles.HandlesExpr as HandlesExpr
+import lib.core.Gen.Translator as HT
 import lib.Stub.StubMerger as StubMerger
-import lib.core.Handles.HandlesExprCall as HandlesExprCall
 import lib.core.CompilerFactory as CompilerFactory
 
 import lib.core.Gen.Call.CallGenBase as CallGenBase