Add Ladill Link URL shortener on ladl.link.

Management UI at link.ladill.com with GHS 0.05 per link wallet billing,
click analytics, and legacy fallback to ladill.com/q for QR ecosystem codes.

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

app/Models/ShortLink.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class ShortLink extends Model
+{
+    protected $fillable = [
+        'user_id',
+        'slug',
+        'label',
+        'destination_url',
+        'is_active',
+        'clicks_total',
+        'unique_clicks_total',
+        'last_clicked_at',
+        'expires_at',
+    ];
+
+    protected $casts = [
+        'is_active' => 'boolean',
+        'clicks_total' => 'integer',
+        'unique_clicks_total' => 'integer',
+        'last_clicked_at' => 'datetime',
+        'expires_at' => 'datetime',
+    ];
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function clicks(): HasMany
+    {
+        return $this->hasMany(LinkClick::class);
+    }
+
+    public function publicUrl(): string
+    {
+        return self::publicBaseUrl().'/'.$this->slug;
+    }
+
+    public static function publicBaseUrl(): string
+    {
+        $domain = (string) config('link.public_domain', 'ladl.link');
+
+        return 'https://'.$domain;
+    }
+
+    public function isExpired(): bool
+    {
+        return $this->expires_at !== null && $this->expires_at->isPast();
+    }
+}