install: backup and restore HorizonOC config.ini on OC pack update

- Copy sd:/config/horizon-oc/config.ini to sd:/.omninx_oc_update before
  update cleanup/copy; restore after Hekate step, then remove the scratch dir.
- Only when INSTALL_MODE_UPDATE and VARIANT_OC.

Made-with: Cursor

source/backup.c

@@ -101,3 +101,34 @@ int cleanup_backup(void) {
     }
     return FR_OK;
 }
+
+int backup_horizon_oc_config_for_oc_update(void) {
+    if (!path_exists(HORIZON_OC_CONFIG_PATH))
+        return FR_OK;
+
+    int res = f_mkdir(HORIZON_OC_UPDATE_BACKUP_DIR);
+    if (res != FR_OK && res != FR_EXIST)
+        return res;
+
+    return file_copy(HORIZON_OC_CONFIG_PATH, HORIZON_OC_UPDATE_BACKUP_INI);
+}
+
+int restore_horizon_oc_config_after_oc_update(void) {
+    if (!path_exists(HORIZON_OC_UPDATE_BACKUP_INI))
+        return FR_OK;
+
+    int res = f_mkdir("sd:/config");
+    if (res != FR_OK && res != FR_EXIST)
+        return res;
+    res = f_mkdir("sd:/config/horizon-oc");
+    if (res != FR_OK && res != FR_EXIST)
+        return res;
+
+    return file_copy(HORIZON_OC_UPDATE_BACKUP_INI, HORIZON_OC_CONFIG_PATH);
+}
+
+int cleanup_horizon_oc_update_backup(void) {
+    if (!path_exists(HORIZON_OC_UPDATE_BACKUP_DIR))
+        return FR_OK;
+    return folder_delete(HORIZON_OC_UPDATE_BACKUP_DIR);
+}