feat: 擴展 i18n 支援 65 種語言 + 完整文件系統

🌐 國際化 (i18n)
- 從 5 種語言擴展到 65 種語言支援
- 新增：歐洲語系 (de, fr, es, it, pt, ru, nl, pl, tr, uk, cs, sv, da, fi, no, el, hu, ro, bg, hr, sk, sl, lt, lv, et, is, ga, cy, mt, mk, sq, ca, eu, gl, sr)
- 新增：中東語系 (ar, he, fa)
- 新增：南亞語系 (hi, bn, ta, te, mr, gu, kn, ml, ne, si)
- 新增：東南亞語系 (th, vi, id, ms, fil, my, km, lo)
- 新增：非洲語系 (af, sw, am, zu)
- 完整翻譯所有 UI 文字

📖 文件系統
- 重構 README.md 為入口型首頁
- 新增 docs/getting-started.md - 快速入門指南
- 新增 docs/docker.md - Docker 部署指南
- 新增 docs/environment-variables.md - 環境變數說明
- 新增 docs/url-id-and-storage.md - 儲存結構說明
- 新增 docs/advanced-usage.md - 進階使用指南
- 更新 docs/i18n.md - 65 種語言清單

✅ 建構驗證
- TypeScript 編譯通過
- Docker 建構通過

src/locales/id.json

@@ -0,0 +1,106 @@
+{
+  "common": {
+    "appName": "ConvertX-CN",
+    "poweredBy": "Didukung oleh",
+    "version": "v{version}",
+    "loading": "Memuat...",
+    "error": "Kesalahan",
+    "success": "Berhasil",
+    "confirm": "Konfirmasi",
+    "cancel": "Batal",
+    "close": "Tutup",
+    "save": "Simpan",
+    "delete": "Hapus",
+    "remove": "Hapus",
+    "download": "Unduh",
+    "upload": "Unggah",
+    "submit": "Kirim",
+    "back": "Kembali",
+    "next": "Berikutnya",
+    "yes": "Ya",
+    "no": "Tidak"
+  },
+  "nav": {
+    "history": "Riwayat",
+    "account": "Akun",
+    "logout": "Keluar",
+    "login": "Masuk",
+    "register": "Daftar",
+    "language": "Bahasa"
+  },
+  "convert": {
+    "title": "Konversi",
+    "titleWithType": "Konversi .{fileType}",
+    "chooseFile": "Pilih file",
+    "orDragHere": "atau seret ke sini",
+    "searchConversions": "Cari konversi",
+    "convertTo": "Konversi ke",
+    "convertButton": "Konversi",
+    "uploading": "Mengunggah...",
+    "processing": "Memproses..."
+  },
+  "results": {
+    "title": "Hasil",
+    "convertedFileName": "Nama File Terkonversi",
+    "status": "Status",
+    "actions": "Tindakan",
+    "downloadAll": "Semua",
+    "downloadTar": "Tar",
+    "deleteJob": "Hapus",
+    "noFiles": "Belum ada file yang dikonversi.",
+    "statusPending": "Menunggu",
+    "statusCompleted": "Selesai",
+    "statusFailed": "Gagal"
+  },
+  "history": {
+    "title": "Hasil",
+    "time": "Waktu",
+    "files": "File",
+    "filesDone": "File Selesai",
+    "status": "Status",
+    "actions": "Tindakan",
+    "expandDetails": "Perluas detail",
+    "detailedFileInfo": "Informasi File Detail:",
+    "deleteSelected": "Hapus Terpilih",
+    "selectAll": "Pilih semua",
+    "confirmDelete": "Apakah Anda yakin ingin menghapus {count} pekerjaan? Tindakan ini tidak dapat dibatalkan.",
+    "deleteSuccess": "Berhasil menghapus {deleted} pekerjaan.",
+    "deleteFailed": "Gagal menghapus {failed} pekerjaan.",
+    "deleteError": "Terjadi kesalahan saat menghapus pekerjaan. Silakan coba lagi."
+  },
+  "auth": {
+    "email": "Email",
+    "password": "Kata Sandi",
+    "currentPassword": "Kata Sandi Saat Ini",
+    "newPassword": "Kata Sandi (kosongkan jika tidak berubah)",
+    "loginButton": "Masuk",
+    "registerButton": "Daftar",
+    "updateButton": "Perbarui",
+    "createAccount": "Buat akun",
+    "invalidCredentials": "Kredensial tidak valid.",
+    "emailInUse": "Email sudah digunakan.",
+    "unauthorized": "Tidak diizinkan",
+    "cookiesRequired": "Cookie harus diaktifkan untuk menggunakan aplikasi ini.",
+    "noCookies": "Tidak ada cookie autentikasi, mungkin browser Anda memblokir cookie."
+  },
+  "setup": {
+    "welcome": "Selamat datang di ConvertX-CN!",
+    "createYourAccount": "Buat akun Anda",
+    "reportIssues": "Laporkan masalah di",
+    "github": "GitHub"
+  },
+  "errors": {
+    "jobNotFound": "Pekerjaan tidak ditemukan.",
+    "fileNotFound": "File tidak ditemukan.",
+    "uploadFailed": "Unggahan gagal.",
+    "conversionFailed": "Konversi gagal.",
+    "serverError": "Kesalahan server."
+  },
+  "upload": {
+    "success": "File berhasil diunggah.",
+    "dragDrop": "Letakkan file di sini"
+  },
+  "file": {
+    "size": "{size} kB"
+  }
+}