docs: добавлены примеры backup файлов для импорта

- Пример wg-easy backup (db.json)
- Пример 3x-ui export
- Подробная документация по импорту
- Инструкции по получению backup файлов
- Список импортируемых данных

examples/3x-ui-backup-example.json

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+{
+  "clients": [
+    {
+      "id": 1,
+      "email": "user1@example.com",
+      "enable": true,
+      "expiryTime": 0,
+      "totalGB": 50,
+      "up": 1073741824,
+      "down": 5368709120
+    },
+    {
+      "id": 2,
+      "email": "user2@example.com",
+      "enable": true,
+      "expiryTime": 1735689600000,
+      "totalGB": 100,
+      "up": 536870912,
+      "down": 2147483648
+    },
+    {
+      "id": 3,
+      "email": "user3@example.com",
+      "enable": false,
+      "expiryTime": 0,
+      "totalGB": 0,
+      "up": 0,
+      "down": 0
+    }
+  ],
+  "settings": {
+    "port": 51820,
+    "interface": "wg0",
+    "mtu": 1420
+  }
+}

examples/README.md

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+# Import Examples
+
+This directory contains example backup files from different VPN panels that can be imported into Amnezia VPN Panel.
+
+## wg-easy-backup-example.json
+
+Example backup file from wg-easy panel (db.json format).
+
+**Features:**
+- Contains 3 clients with different configurations
+- Includes public/private keys and pre-shared keys
+- Shows enabled and disabled clients
+- Preserves original IP addresses
+
+**How to get from wg-easy:**
+```bash
+# SSH into your wg-easy server
+ssh user@your-server
+
+# Copy the database file
+docker cp wg-easy:/app/data/db.json ./wg-easy-backup.json
+```
+
+## 3x-ui-backup-example.json
+
+Example export file from 3x-ui panel.
+
+**Features:**
+- Contains 3 clients with traffic statistics
+- Includes expiration dates and traffic limits
+- Shows enabled and disabled clients
+- Contains server settings (port, interface, MTU)
+
+**How to get from 3x-ui:**
+1. Login to your 3x-ui panel
+2. Go to Settings
+3. Click "Export" button
+4. Save the JSON file
+
+## Import Process
+
+1. **Create New Server:**
+   - Go to "Servers" → "Add Server"
+   - Fill in SSH connection details
+   - Check "Import from existing panel"
+
+2. **Select Panel Type:**
+   - Choose "wg-easy" or "3x-ui"
+   - Upload your backup file
+
+3. **Deploy:**
+   - Click "Create Server"
+   - Wait for deployment
+   - Clients will be imported automatically
+
+## What Gets Imported
+
+### From wg-easy:
+- ✅ Client names
+- ✅ Public/private keys
+- ✅ Pre-shared keys
+- ✅ IP addresses
+- ✅ Enabled/disabled status
+- ✅ Creation timestamps
+
+### From 3x-ui:
+- ✅ Client names (from email field)
+- ✅ Traffic limits (totalGB)
+- ✅ Expiration dates
+- ✅ Enabled/disabled status
+- ⚠️ Keys will be auto-generated (3x-ui doesn't export them)
+- ⚠️ IP addresses will be auto-assigned
+
+## Troubleshooting
+
+**Import fails with "Invalid JSON format":**
+- Ensure your backup file is valid JSON
+- Check that it matches the expected format for your panel type
+
+**Some clients not imported:**
+- Check import history in the panel
+- Review error messages for specific clients
+- Ensure client names are unique
+
+**Keys not working after import:**
+- wg-easy imports preserve original keys
+- 3x-ui imports generate new keys (clients need new configs)

examples/wg-easy-backup-example.json

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+{
+  "clients": [
+    {
+      "name": "John Doe Phone",
+      "enabled": true,
+      "address": "10.8.1.2",
+      "publicKey": "qwerty123456789abcdefghijklmnopqrstuvwxyz=",
+      "privateKey": "privatekey123456789abcdefghijklmnopqrstuvwxyz=",
+      "preSharedKey": "presharedkey123456789abcdefghijklmnopqrstuvwxyz=",
+      "createdAt": "2024-01-15T10:30:00.000Z"
+    },
+    {
+      "name": "Jane Smith Laptop",
+      "enabled": true,
+      "address": "10.8.1.3",
+      "publicKey": "asdfgh987654321zyxwvutsrqponmlkjihgfedcba=",
+      "privateKey": "privatekey987654321zyxwvutsrqponmlkjihgfedcba=",
+      "preSharedKey": "presharedkey987654321zyxwvutsrqponmlkjihgfedcba=",
+      "createdAt": "2024-02-20T15:45:00.000Z"
+    },
+    {
+      "name": "Bob Office PC",
+      "enabled": false,
+      "address": "10.8.1.4",
+      "publicKey": "zxcvbn111222333444555666777888999000aaabbb=",
+      "createdAt": "2024-03-10T08:20:00.000Z"
+    }
+  ]
+}