feat: initialize Infra Manager with React, Tailwind CSS, and Inertia.js

- Added main application entry point (app.jsx) and bootstrap file for React setup.
- Created Wiki index page (Index.jsx) for documentation and file management.
- Implemented utility functions for formatting and status handling in utils.js.
- Set up Blade template (app.blade.php) for Inertia.js integration.
- Defined API routes for metrics and terminal access in api.php.
- Established console commands for scheduled tasks in console.php.
- Created web routes for various application features including authentication, hypervisors, containers, cloud accounts, security, backups, and wiki management in web.php.
- Developed setup scripts for Windows (setup.ps1) and Linux (setup.sh) environments.
- Configured Tailwind CSS for styling with custom themes and animations in tailwind.config.js.
- Set up Vite for asset bundling and development server in vite.config.js.

app/Models/Backup.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Backup extends Model
+{
+    protected $fillable = [
+        'policy_id', 'target_type', 'target_id', 'target_name',
+        'status', 'storage_path', 'size_bytes', 'checksum', 'metadata', 'notes',
+        'expires_at', 'created_by', 'started_at', 'completed_at',
+    ];
+    protected $casts = ['metadata' => 'array', 'expires_at' => 'datetime', 'started_at' => 'datetime', 'completed_at' => 'datetime'];
+    public function policy() { return $this->belongsTo(BackupPolicy::class); }
+}