chore(syntax): Test 仓 R1 + R12 迁移

R1：T | t.CPtr -> T*（40 文件 / 1121 处；含多级 **、强转位 (T*)(x)、下标内 list[AST*]）；引号前向引用 'Rect' | t.CPtr 26 处按例外保留，T | t.CPtr | t.State 25 处因 T* 后不能接 | 保持原联合写法。

R12：i = 0 + while i < N: + 尾 i += 1 -> or i in range(N):（10 文件 / 42 处；含 <= -> range(EXPR + 1)、带注解初始化 i: int = 0、尾 i = i + 1）。余 20 处经守卫判定不可安全改写（复合条件 1、尾部非自增 8、体内重绑定/continue 5、while-else 2、循环后仍被读取 2、找不到初始化 2）。

IterTest/App/main.vp

@@ -5,7 +5,7 @@ import testcheck
 
 def test_for_in_string():
     testcheck.section("Test 1: for-in string iteration")
-    s: char | t.CPtr = "Hello"
+    s: char* = "Hello"
     result: int = 0
     for ch in s:
         result += ch
@@ -14,7 +14,7 @@ def test_for_in_string():
 
 def test_for_in_char_ptr():
     testcheck.section("Test 2: for-in char* iteration")
-    s: char | t.CPtr = "ABC"
+    s: char* = "ABC"
     chars: t.CArray[int, 4] = [0]
     idx: int = 0
     for ch in s:
@@ -25,16 +25,16 @@ def test_for_in_char_ptr():
 
 def test_strcpy_for_in():
     testcheck.section("Test 3: strcpy using for-in")
-    src: char | t.CPtr = "test"
+    src: char* = "test"
     # 手动实现 strcpy 用 for-in
     import w32.win32memory
-    buf: char | t.CPtr = w32.win32memory.VirtualAlloc(None, 64, 12288, 4)
+    buf: char* = w32.win32memory.VirtualAlloc(None, 64, 12288, 4)
     if uint64(buf) == 0:
         stdio.printf("SKIP: VirtualAlloc returned NULL\n")
         return
     string.memset(buf, 0, 64)
     # 用 for-in 复制
-    p: char | t.CPtr = buf
+    p: char* = buf
     for ch in src:
         p[0] = ch
         p += 1