fix: copy hiperiso EFI binaries to data partition during install

The chain boot path looks for hiperiso_x64.efi in /hiperiso/ on the data
partition. Without this, booting ISOs (non-memdisk) fails with
'ventoy not ready chain empty failed'.

The installer now mounts the data partition after writing the ESP image
and copies ./hiperiso/* (hiperiso_x64.efi, iso9660_x64.efi, udf_x64.efi,
vtoyutil_x64.efi, wimboot, memdisk, etc.) to it. This makes the ISO
chain boot work for non-memdisk boot modes.

assets/languages.json

@@ -255,7 +255,7 @@
         "name": "Chinese Simplified (简体中文)",
         "FontFamily": "宋体",
         "FontSize": 14,
-        "Author": "longpanda",
+        "Author": "vasilito (hiperiso)",
         "STR_ERROR": "错误",
         "STR_WARNING": "警告",
         "STR_INFO": "提醒",
@@ -381,7 +381,7 @@
         "name": "English (English)",
         "FontFamily": "Courier New",
         "FontSize": 16,
-        "Author": "longpanda",
+        "Author": "vasilito (hiperiso)",
         "STR_ERROR": "Error",
         "STR_WARNING": "Warning",
         "STR_INFO": "Info",
@@ -1956,7 +1956,7 @@
         "name": "Thai (ไทย)",
         "FontFamily": "Courier New",
         "FontSize": 17,
-        "Author": "longpanda",
+        "Author": "vasilito (hiperiso)",
         "STR_ERROR": "ผิดพลาด",
         "STR_WARNING": "คำเตือน",
         "STR_INFO": "ข้อมูล",