rebuild and optimize binary

DISTRIBUTION.md

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+# Distribution Guide
+
+## Single Binary Distribution
+
+Ya, untuk distribusi cukup share file `drive-migrator.exe` saja! Binary Go sudah self-contained.
+
+### Build untuk Distribusi
+
+```bash
+# Build optimized (ukuran lebih kecil)
+go build -ldflags="-s -w" -buildvcs=false
+
+# Hasil: drive-migrator.exe (~7.4 MB)
+```
+
+### Requirements untuk End User
+
+**Yang WAJIB ada di mesin target:**
+1. **rclone** - Download dari https://rclone.org/downloads/
+   ```bash
+   # Windows (PowerShell as Admin)
+   winget install Rclone.Rclone
+   
+   # Atau manual download dan add ke PATH
+   ```
+
+**Yang TIDAK perlu:**
+- Go compiler
+- Source code
+- Dependencies lain
+
+### Cara Distribusi
+
+#### Option 1: Direct Binary
+```
+📁 drive-migrator-v1.0/
+├── drive-migrator.exe
+├── README.md
+└── examples/
+    ├── nextcloud-to-gdrive.bat
+    └── gdrive-to-onedrive.bat
+```
+
+#### Option 2: Installer Package
+Buat installer sederhana yang:
+1. Copy `drive-migrator.exe` ke `C:\Program Files\drive-migrator\`
+2. Add ke PATH
+3. Check apakah rclone sudah terinstall
+4. Buat shortcut di Start Menu
+
+#### Option 3: Portable ZIP
+```
+📁 drive-migrator-portable.zip
+├── drive-migrator.exe
+├── README.md
+├── examples/
+└── install-rclone.bat  # Script untuk install rclone otomatis
+```
+
+### Cross-Platform Build
+
+Untuk distribusi multi-platform:
+
+```bash
+# Windows 64-bit
+GOOS=windows GOARCH=amd64 go build -ldflags="-s -w" -buildvcs=false -o dist/windows/drive-migrator.exe
+
+# Linux 64-bit
+GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -buildvcs=false -o dist/linux/drive-migrator
+
+# macOS 64-bit
+GOOS=darwin GOARCH=amd64 go build -ldflags="-s -w" -buildvcs=false -o dist/macos/drive-migrator
+
+# macOS ARM (M1/M2)
+GOOS=darwin GOARCH=arm64 go build -ldflags="-s -w" -buildvcs=false -o dist/macos-arm/drive-migrator
+```
+
+### Example Batch Files untuk User
+
+**nextcloud-to-gdrive.bat:**
+```batch
+@echo off
+echo Starting Nextcloud to Google Drive migration...
+drive-migrator.exe migrate ^
+  --source-name nextcloud_source ^
+  --source-type nextcloud ^
+  --source-url "https://your-nextcloud.com/remote.php/dav/files/username" ^
+  --source-user "username" ^
+  --source-pass "password" ^
+  --dest-name gdrive_dest ^
+  --dest-type gdrive ^
+  --dest-sa-file "service-account.json" ^
+  --log-file migration.log ^
+  --include "Documents/**"
+pause
+```
+
+### Checklist Distribusi
+
+- ✅ Binary sudah optimized (`-ldflags="-s -w"`)
+- ✅ README dengan contoh penggunaan
+- ✅ Example scripts/batch files
+- ✅ Instruksi install rclone
+- ✅ Troubleshooting guide
+- ⚠️ Test di mesin bersih (tanpa Go/development tools)
+
+### Tips untuk End User
+
+1. **Letakkan di folder khusus:**
+   ```
+   C:\Tools\drive-migrator\
+   ├── drive-migrator.exe
+   ├── configs/
+   └── logs/
+   ```
+
+2. **Add ke PATH** agar bisa dipanggil dari mana saja
+
+3. **Buat config file** di `%USERPROFILE%\.drive-migrator.yaml`
+
+Jadi ya, cukup share `drive-migrator.exe` + dokumentasi + pastikan user install rclone!