Expand Link app with analytics, settings, and custom domains.

Add Bitly-style branded domain support via Ladill Domains SSL API,
account analytics dashboard, settings page with default domain picker,
and fix SSO/dashboard issues from QR Plus template leftovers.

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

app/Models/LinkCustomDomain.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * Customer-branded short-link domain (e.g. go.brand.com) for Ladill Link.
+ */
+class LinkCustomDomain extends Model
+{
+    public const STATUS_PENDING = 'pending';
+
+    public const STATUS_ACTIVE = 'active';
+
+    public const STATUS_FAILED = 'failed';
+
+    protected $fillable = [
+        'user_id', 'host', 'include_www', 'is_default', 'status', 'ssl_status',
+        'dns_verified_at', 'ssl_issued_at', 'ssl_expires_at', 'last_error',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'include_www' => 'boolean',
+            'is_default' => 'boolean',
+            'dns_verified_at' => 'datetime',
+            'ssl_issued_at' => 'datetime',
+            'ssl_expires_at' => 'datetime',
+        ];
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function isLive(): bool
+    {
+        return $this->status === self::STATUS_ACTIVE && $this->ssl_status === self::STATUS_ACTIVE;
+    }
+
+    public function baseUrl(): string
+    {
+        return 'https://'.$this->host;
+    }
+
+    protected static function booted(): void
+    {
+        static::saving(function (LinkCustomDomain $domain) {
+            $domain->host = strtolower(trim((string) $domain->host, " \t\n\r\0\x0B./"));
+            $domain->host = preg_replace('/^www\./', '', $domain->host) ?: $domain->host;
+        });
+    }
+}