fix(len): 特化方法按结构体真实名查找

泛型特化结构体的 LLVM 名可能带模块 SHA1 前缀；__len__ 分派先按该真实名查找，再回退裸模板类。

lib/core/Handles/HandlesExprUtils.py

@@ -178,11 +178,26 @@ class ExprUtils:
         if not Gen._has_function(FullMethodName):
             FullMethodName = f'{ClassName}.{op_name}__'
         if not Gen._has_function(FullMethodName) and '[' in ClassName:
-            # 泛型特化方法尚未生成时，回退到裸模板类的方法（如 list.__len__）
-            _BareClass: str = ClassName.split('[', 1)[0]
-            FullMethodName = f'{_BareClass}.{op_name}'
+            # 泛型特化方法尚未生成时，先补发特化，再回退裸模板类（如 list.__len__）
+            try:
+                self.Trans.ExprCallHandle._try_complete_generic_specialization(ClassName, op_name, Gen)
+            except Exception:
+                pass
+            FullMethodName = f'{ClassName}.{op_name}'
             if not Gen._has_function(FullMethodName):
-                FullMethodName = f'{_BareClass}.{op_name}__'
+                FullMethodName = f'{ClassName}.{op_name}__'
+            if not Gen._has_function(FullMethodName):
+                _SpecTy: Any = Gen.structs.get(ClassName)
+                _SpecName: str = getattr(_SpecTy, 'name', '') if _SpecTy is not None else ''
+                if _SpecName:
+                    FullMethodName = f'{_SpecName}.{op_name}'
+                    if not Gen._has_function(FullMethodName):
+                        FullMethodName = f'{_SpecName}.{op_name}__'
+            if not Gen._has_function(FullMethodName):
+                _BareClass: str = ClassName.split('[', 1)[0]
+                FullMethodName = f'{_BareClass}.{op_name}'
+                if not Gen._has_function(FullMethodName):
+                    FullMethodName = f'{_BareClass}.{op_name}__'
         if not Gen._has_function(FullMethodName):
             # 多继承：沿 MRO 祖先链查找 dunder 方法（先声明父类优先，与 VPC 一致）
             for anc in Gen._get_mro_chain(ClassName)[1:]: