feat: complete person identity matching system with fuzzy detection, revert, and manual link

Implements the full identity matching engine: email matching (HIGH confidence),
fuzzy name matching with Levenshtein distance (MEDIUM confidence, upgradable to
HIGH with DOB tiebreaker), manual link/unlink, revert confirmed matches, and
automatic detection via PersonObserver. Includes 33 comprehensive tests, frontend
integration with confirm/dismiss/unlink UI, and match indicators in the persons list.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/Providers/AppServiceProvider.php

@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace App\Providers;
 
+use App\Models\Person;
+use App\Observers\PersonObserver;
 use Illuminate\Auth\Notifications\ResetPassword;
 use Illuminate\Support\ServiceProvider;
 
@@ -16,6 +18,8 @@ class AppServiceProvider extends ServiceProvider
 
     public function boot(): void
     {
+        Person::observe(PersonObserver::class);
+
         ResetPassword::createUrlUsing(function ($user, string $token) {
             return config('crewli.portal_url') . '/wachtwoord-resetten?token=' . $token . '&email=' . urlencode($user->email);
         });