refactor(registry): 使用ErrorCode类型替换int作为错误返回值

- 将registry_service.h/c中的函数返回值从int改为ErrorCode枚举
- 更新callbacks.c中的错误检查逻辑，使用ERR_OK常量进行比较
- 在内部辅助函数中返回具体的错误码（ERR_REGISTRY_FAILED等）
- 提高代码类型安全性和错误处理可读性

src/core/registry_service.c

@@ -1,5 +1,6 @@
 #include "core/registry_service.h"
 #include "utils/string_ext.h"
+#include "utils/error_code.h"
 #include <windows.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -9,7 +10,7 @@
 #define REG_VALUE L"Path"
 
 // 内部辅助函数：加载单个列表
-static int load_single_path(HKEY hKeyRoot, const wchar_t *regPath, StringList *list)
+static ErrorCode load_single_path(HKEY hKeyRoot, const wchar_t *regPath, StringList *list)
 {
     clear_string_list(list);
 
@@ -17,7 +18,7 @@ static int load_single_path(HKEY hKeyRoot, const wchar_t *regPath, StringList *l
     LONG res = RegOpenKeyExW(hKeyRoot, regPath, 0, KEY_READ, &hKey);
     if (res != ERROR_SUCCESS)
     {
-        return 0; // 失败
+        return ERR_REGISTRY_FAILED;
     }
 
     DWORD type, size;
@@ -59,25 +60,26 @@ static int load_single_path(HKEY hKeyRoot, const wchar_t *regPath, StringList *l
         }
     }
     RegCloseKey(hKey);
-    return 1; // 成功
+    return ERR_OK;
 }
 
 // 加载系统环境变量路径
-int load_system_paths(StringList *list)
+ErrorCode load_system_paths(StringList *list)
 {
     return load_single_path(HKEY_LOCAL_MACHINE, REG_PATH_SYS, list);
 }
 
 // 加载用户环境变量路径
-int load_user_paths(StringList *list)
+ErrorCode load_user_paths(StringList *list)
 {
     return load_single_path(HKEY_CURRENT_USER, REG_PATH_USER, list);
 }
 
 // 内部辅助函数：保存单个列表
-static int save_single_path(HKEY hKeyRoot, const wchar_t *regPath, const StringList *list)
+static ErrorCode save_single_path(HKEY hKeyRoot, const wchar_t *regPath, const StringList *list)
 {
-    if (!list) return 0;
+    if (!list)
+        return ERR_NULL_PTR;
 
     // 计算大小
     size_t total_len = 0;
@@ -97,7 +99,7 @@ static int save_single_path(HKEY hKeyRoot, const wchar_t *regPath, const StringL
 
     wchar_t *buffer = (wchar_t *)malloc(total_len * sizeof(wchar_t));
     if (!buffer)
-        return 0;
+        return ERR_OUT_OF_MEMORY;
 
     buffer[0] = L'\0';
     for (int i = 0; i < list->count; i++)
@@ -116,29 +118,29 @@ static int save_single_path(HKEY hKeyRoot, const wchar_t *regPath, const StringL
     }
 
     HKEY hKey;
-    int success = 0;
+    ErrorCode result = ERR_PERMISSION_DENIED;
     if (RegOpenKeyExW(hKeyRoot, regPath, 0, KEY_WRITE, &hKey) == ERROR_SUCCESS)
     {
         DWORD size = (DWORD)((wcslen(buffer) + 1) * sizeof(wchar_t));
         if (RegSetValueExW(hKey, REG_VALUE, 0, REG_EXPAND_SZ, (LPBYTE)buffer, size) == ERROR_SUCCESS)
         {
-            success = 1;
+            result = ERR_OK;
         }
         RegCloseKey(hKey);
     }
 
     free(buffer);
-    return success;
+    return result;
 }
 
 // 保存系统环境变量路径
-int save_system_paths(const StringList *list)
+ErrorCode save_system_paths(const StringList *list)
 {
     return save_single_path(HKEY_LOCAL_MACHINE, REG_PATH_SYS, list);
 }
 
 // 保存用户环境变量路径
-int save_user_paths(const StringList *list)
+ErrorCode save_user_paths(const StringList *list)
 {
     return save_single_path(HKEY_CURRENT_USER, REG_PATH_USER, list);
 }