Initial Ladill Transfer app — file sharing with QR links.

Scaffolded from the Ladill mini/events extraction pattern: multi-file transfers,
retention controls, public landing pages, analytics, and Gitea deploy workflow.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/Transfer.php

@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Transfer extends Model
+{
+    public const STATUS_ACTIVE = 'active';
+
+    public const STATUS_EXPIRED = 'expired';
+
+    public const STATUS_DELETED = 'deleted';
+
+    protected $fillable = [
+        'user_id',
+        'qr_code_id',
+        'title',
+        'message',
+        'password_hash',
+        'retention_days',
+        'expires_at',
+        'status',
+        'downloads_total',
+        'storage_bytes',
+    ];
+
+    protected $casts = [
+        'retention_days' => 'integer',
+        'expires_at' => 'datetime',
+        'downloads_total' => 'integer',
+        'storage_bytes' => 'integer',
+    ];
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function qrCode(): BelongsTo
+    {
+        return $this->belongsTo(QrCode::class);
+    }
+
+    public function files(): HasMany
+    {
+        return $this->hasMany(TransferFile::class);
+    }
+
+    public function downloadEvents(): HasMany
+    {
+        return $this->hasMany(TransferDownloadEvent::class);
+    }
+
+    public function isActive(): bool
+    {
+        if ($this->status !== self::STATUS_ACTIVE) {
+            return false;
+        }
+
+        if ($this->expires_at && $this->expires_at->isPast()) {
+            return false;
+        }
+
+        return true;
+    }
+
+    public function isPasswordProtected(): bool
+    {
+        return $this->password_hash !== null && $this->password_hash !== '';
+    }
+
+    public function storageGb(): float
+    {
+        return round($this->storage_bytes / (1024 * 1024 * 1024), 3);
+    }
+
+    public function monthlyCostGhs(): float
+    {
+        return round($this->storageGb() * (float) config('transfer.price_per_gb_month', 1.0), 2);
+    }
+}