fix

src/middleware-dispatcher/proto-middleware-dispatcher.ts

@@ -60,7 +60,7 @@ export class ProtoMiddlewareDispatcher<
     // buildMiddlewares 只需要知道 inst
     if (args.length === 0) return [];
 
-    const inst = args[args.length - 1];
+    const inst = args[0];
     if (!inst || typeof inst !== 'object') return [];
 
     // 1. 收集原型链（Base → Sub）

tests/proto-middleware-dispatcher.spec.ts

@@ -54,7 +54,7 @@ describe('ProtoMiddlewareDispatcher', () => {
       order.push('base:normal');
       expect(inst).toBeInstanceOf(Base);
       expect(inst.value).toBe(8); // 5 + 3
-      expect(x).toBe(7);
+      expect(x).toBe(555);
       ++inst.value;
       return next();
     });