refactor: 重构前端代码并添加日志功能

- 重命名和重构了多个文件，包括 lexer、parser 和 AST 相关代码
- 添加了日志功能，使用 LOG_* 宏替代原有的 error 和 warn 函数
- 优化了错误处理和内存分配方式
- 调整了代码结构，提高了模块化和可读性

lib/rt/std/rt_std.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "rt_api_def.h"
+
+const smcc_rt_t rt = {
+    ._malloc = (rt_malloc)malloc,
+    ._free = (rt_free)free,
+    .exit = (rt_exit)exit,
+
+    .fopen =  (rt_fopen_t)fopen,
+    .fflush = (rt_fflush_t)fflush,
+    .fclose = (rt_fclose_t)fclose,
+    .freads = (rt_freads_t)fread_s,
+    .fwrite = (rt_fwrite_t)fwrite,
+
+    ._realloc =  (rt_realloc_t)realloc,
+    .fprintf =  (rt_fprintf_t)fprintf,
+    .snprintf = (rt_snprintf_t)snprintf,
+};
+
+rt_file_t rt_stdin;
+rt_file_t rt_stdout;
+rt_file_t rt_stderr;
+
+void init_rt_std() {
+    rt_stdin = stdin;
+    rt_stdout = stdout;
+    rt_stderr = stderr;
+}