fix(socket): socket/accept 的 u64 handle 在 INT 目标处补显式窄化（与 213/328 对称，修隐式窄化报错）

socket.vp

@@ -212,7 +212,7 @@ class Socket:
         if platmacro.IS_WINDOWS:
             self.fd = INT(win32.winsock2.socket(family, type, protocol))
         else:
-            self.fd = socket(family, type, protocol)
+            self.fd = INT(socket(family, type, protocol))
 
     def connect(self, host: str, port: INT) -> INT:
         """Connect to remote host.
@@ -334,7 +334,7 @@ class Socket:
             out_client.protocol = self.protocol
             return INT(client_fd)
 
-        client_fd: INT = accept(self.fd, &addr, &addrlen)
+        client_fd: INT = INT(accept(self.fd, &addr, &addrlen))
         if client_fd == SOCKET_ERROR:
             return SOCKET_ERROR
         out_client.fd = client_fd
@@ -407,7 +407,7 @@ def SocketCreate(family: INT, type: INT, protocol: INT, out_sock: Socket*) -> IN
         out_sock.fd = INT(fd)
         if fd == win32.winsock2.INVALID_SOCKET: return -1
     else:
-        fd: INT = socket(family, type, protocol)
+        fd: INT = INT(socket(family, type, protocol))
         out_sock.fd = fd
         if fd == INVALID_SOCKET: return -1
     return 0