refactor(auth): upgrade email verification hash to sha256

Move the email-verification URL hash from sha1 to sha256 and verify it
directly in the controller using hash_equals, instead of going through
Laravel's EmailVerificationRequest (which only compares against sha1).
The signed URL still carries the authoritative HMAC; the hash upgrade
keeps the identity binding aligned with modern hashing guidance.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/Models/User.php

@@ -257,7 +257,7 @@ class User extends Authenticatable implements SendsEmail
             Carbon::now()->addMinutes(Config::get('auth.verification.expire', 60)),
             [
                 'id' => $this->getKey(),
-                'hash' => sha1($this->getEmailForVerification()),
+                'hash' => hash('sha256', $this->getEmailForVerification()),
             ]
         );
         $mail->view('emails.email-verification', [