chore(test): 迁移测试夹具到新语法

机械规则 R2/R3/R4/R6/R7/R8/R13 + R16 保守子集，共 86 文件 2127 行。R1（T | t.CPtr）与 R12（while 下标循环）未做，仍列为待办。全量 77/77 顺序回归通过。

StructTest/App/main.vp

@@ -5,15 +5,15 @@ import testcheck
 
 # 定义结构体
 class Point():
-    x: t.CInt
-    y: t.CInt
+    x: int
+    y: int
 
 class Rect():
     origin: Point
     size: Point
 
 class Node():
-    value: t.CInt
+    value: int
     next: t.CPtr  # Node* 类型
 
 def test_struct_basic():
@@ -38,7 +38,7 @@ def test_struct_pointer():
     p.x = 42
     p.y = 84
     # 取结构体指针
-    pp: Point | t.CPtr = t.CPtr(t.CUInt64T(p))
+    pp: Point | t.CPtr = t.CPtr(uint64(p))
     # 通过指针修改
     pp.x = 100
     pp.y = 200
@@ -50,17 +50,17 @@ def test_struct_param():
     p: Point = Point()
     p.x = 5
     p.y = 15
-    sum_val: t.CInt = point_sum(p)
+    sum_val: int = point_sum(p)
     testcheck.check(sum_val == 20, "struct param (sum=20)", "struct param (sum expect 20)")
 
-def point_sum(p: Point) -> t.CInt:
+def point_sum(p: Point) -> int:
     return p.x + p.y
 
 def test_struct_array():
     testcheck.section("Test 5: struct array")
     # 分配结构体数组
-    buf: t.CUInt8T | t.CPtr = w32.win32memory.VirtualAlloc(None, 256, 12288, 4)
-    if t.CUInt64T(buf) == 0:
+    buf: uint8 | t.CPtr = w32.win32memory.VirtualAlloc(None, 256, 12288, 4)
+    if uint64(buf) == 0:
         stdio.printf("SKIP: VirtualAlloc returned NULL\n")
         return
     string.memset(buf, 0, 256)
@@ -70,12 +70,12 @@ def test_struct_array():
     pts[0].y = 2
     pts[1].x = 3
     pts[1].y = 4
-    total: t.CInt = pts[0].x + pts[0].y + pts[1].x + pts[1].y
+    total: int = pts[0].x + pts[0].y + pts[1].x + pts[1].y
     testcheck.check(total == 10, "struct array (total=10)", "struct array (total expect 10)")
 
 import w32.win32memory
 
-def main() -> t.CInt:
+def main() -> int:
     testcheck.begin("StructTest: 结构体操作基准测试")
     test_struct_basic()
     test_struct_nested()