refactor: 重构项目为 MVC 架构并移除全局变量

- 将原有扁平目录结构重构为 MVC 分层架构：
  * src/core/: 核心业务逻辑（Model），完全独立于 UI 框架
  * src/ui/: 界面组件构建（View），负责纯视觉展示
  * src/controller/: 用户交互处理（Controller），连接数据与界面
  * src/utils/: 底层工具函数，专注于系统调用和字符串处理
- 引入 AppContext 结构体统一管理应用状态，替代原有的全局变量模式
- 重命名并重新组织头文件，按功能模块划分到对应子目录
- 更新 CMakeLists.txt 以适配新的目录结构
- 同步更新 README.md 文档，说明新的架构设计

src/utils/os_env.c

@@ -0,0 +1,90 @@
+#include "utils/os_env.h"
+#include "utils/string_ext.h"
+#include <windows.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <direct.h>
+
+// 检查管理员权限
+int check_admin(void)
+{
+    HKEY hKey;
+    LONG result = RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment", 0, KEY_WRITE, &hKey);
+    if (result == ERROR_SUCCESS)
+    {
+        RegCloseKey(hKey);
+        return 1;
+    }
+    return 0;
+}
+
+// 内部：检查路径是否存在
+static int path_exists(const char *path)
+{
+    // 如果包含 %，说明是变量，无法直接检查存在性，默认视为有效
+    if (strchr(path, '%'))
+        return 1;
+
+    wchar_t *wpath = utf8_to_wide(path);
+    if (!wpath)
+        return 0;
+
+    DWORD attr = GetFileAttributesW(wpath);
+    free(wpath);
+
+    if (attr == INVALID_FILE_ATTRIBUTES)
+        return 0;
+    return (attr & FILE_ATTRIBUTE_DIRECTORY); // 必须是目录
+}
+
+// 检查路径是否存在（公开给外部使用）
+int is_path_valid(const char *path)
+{
+    return path_exists(path);
+}
+
+// 备份注册表
+void backup_registry(void)
+{
+    // 创建 records 目录
+    if (_mkdir("records") == -1)
+    {
+        // 目录可能已存在，忽略错误
+    }
+
+    // 获取当前时间
+    time_t t = time(NULL);
+    struct tm *tm_info = localtime(&t);
+    char time_str[64];
+    strftime(time_str, sizeof(time_str), "%Y%m%d_%H%M%S", tm_info);
+
+    // 构造备份文件名
+    char filename[256];
+    snprintf(filename, sizeof(filename), "records\\backup_%s.reg", time_str);
+
+    // 构造 reg export 命令
+    char full_cmd[1024];
+    snprintf(full_cmd, sizeof(full_cmd), "reg.exe export \"HKLM\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment\" \"%s\" /y", filename);
+
+    // 使用 CreateProcess 隐藏窗口执行
+    STARTUPINFOA si;
+    PROCESS_INFORMATION pi;
+    memset(&si, 0, sizeof(si));
+    si.cb = sizeof(si);
+    si.dwFlags = STARTF_USESHOWWINDOW;
+    si.wShowWindow = SW_HIDE; // 隐藏窗口
+    memset(&pi, 0, sizeof(pi));
+
+    if (CreateProcessA(NULL, full_cmd, NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, NULL, &si, &pi))
+    {
+        // 等待进程结束
+        WaitForSingleObject(pi.hProcess, INFINITE);
+
+        DWORD exit_code = 0;
+        GetExitCodeProcess(pi.hProcess, &exit_code);
+
+        CloseHandle(pi.hProcess);
+        CloseHandle(pi.hThread);
+    }
+}

src/utils/string_ext.c

@@ -0,0 +1,101 @@
+#include "utils/string_ext.h"
+#include <windows.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+// 宽字符转UTF-8 (用于IUP显示)
+char *wide_to_utf8(const wchar_t *wstr)
+{
+    if (!wstr)
+        return NULL;
+    int size_needed = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);
+    char *str = (char *)malloc(size_needed);
+    if (str)
+    {
+        WideCharToMultiByte(CP_UTF8, 0, wstr, -1, str, size_needed, NULL, NULL);
+    }
+    return str;
+}
+
+// UTF-8转宽字符 (用于Windows API)
+wchar_t *utf8_to_wide(const char *str)
+{
+    if (!str)
+        return NULL;
+    int size_needed = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
+    wchar_t *wstr = (wchar_t *)malloc(size_needed * sizeof(wchar_t));
+    if (wstr)
+    {
+        MultiByteToWideChar(CP_UTF8, 0, str, -1, wstr, size_needed);
+    }
+    return wstr;
+}
+
+// 初始化字符串列表
+void init_string_list(StringList *list)
+{
+    if (!list)
+        return;
+    list->items = NULL;
+    list->count = 0;
+    list->capacity = 0;
+}
+
+// 不区分大小写的字符串查找 (简单实现)
+char *stristr(const char *haystack, const char *needle)
+{
+    if (!haystack || !needle)
+        return NULL;
+    if (*needle == '\0')
+        return (char *)haystack;
+
+    const char *h = haystack;
+    const char *n = needle;
+    const char *h_start = haystack;
+
+    while (*h)
+    {
+        h_start = h;
+        n = needle;
+        while (*h && *n && (tolower((unsigned char)*h) == tolower((unsigned char)*n)))
+        {
+            h++;
+            n++;
+        }
+        if (*n == '\0')
+            return (char *)h_start;
+        h = h_start + 1;
+    }
+    return NULL;
+}
+
+// 添加字符串到列表
+void add_string_list(StringList *list, const char *str)
+{
+    if (!list || !str)
+        return;
+    if (list->count >= list->capacity)
+    {
+        list->capacity = (list->capacity == 0) ? 16 : list->capacity * 2;
+        list->items = (char **)realloc(list->items, list->capacity * sizeof(char *));
+    }
+    list->items[list->count] = _strdup(str); // 复制字符串
+    list->count++;
+}
+
+// 清空字符串列表
+void clear_string_list(StringList *list)
+{
+    if (!list)
+        return;
+    for (int i = 0; i < list->count; i++)
+    {
+        free(list->items[i]);
+    }
+    free(list->items);
+    list->items = NULL;
+    list->count = 0;
+    list->capacity = 0;
+}