fix: harden Vultr create, Gmail identity, and provider retries

Wrap Vultr server creation in DB transactions and delete the remote
instance when local persistence fails (API and Livewire). Scope
plus/dot email normalization to gmail.com/googlemail.com only.
Use throw:false on DigitalOcean/Vultr HTTP retries, and normalize
service log line counts via normalizeLogLines.

tests/Feature/RegistrationRateLimitTest.php

@@ -3,6 +3,7 @@
 use App\Models\InstanceSettings;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\RateLimiter;
 
 uses(RefreshDatabase::class);
 
@@ -42,9 +43,9 @@ it('rate limits repeated registration attempts from the same ip', function () {
 
 it('rate limits dotted plus-address variants of the same email identity across ips', function () {
     $emails = [
-        'ke.vinmcfadden+one@btinternet.com',
-        'kevin.mcfadden+two@btinternet.com',
-        'k.e.v.i.n.m.c.f.a.d.d.e.n+three@btinternet.com',
+        'ke.vinmcfadden+one@gmail.com',
+        'kevin.mcfadden+two@gmail.com',
+        'k.e.v.i.n.m.c.f.a.d.d.e.n+three@gmail.com',
     ];
 
     foreach ($emails as $index => $email) {
@@ -64,9 +65,33 @@ it('rate limits dotted plus-address variants of the same email identity across i
     $this->withServerVariables(['REMOTE_ADDR' => '203.0.113.99'])
         ->post('/register', [
             'name' => 'Blocked User',
-            'email' => 'k.evin.mcfadden+four@btinternet.com',
+            'email' => 'k.evin.mcfadden+four@gmail.com',
             'password' => 'Password1!@',
             'password_confirmation' => 'Password1!@',
         ])
         ->assertTooManyRequests();
 });
+
+it('keeps distinct dotted and plus-addressed mailboxes in separate rate limit buckets on ordinary domains', function () {
+    $registrationIpKey = 'registration:ip:'.sha1('127.0.0.1');
+    $emails = [
+        'john.smith@example.com',
+        'johnsmith@example.com',
+        'johnsmith+one@example.com',
+        'johnsmith+two@example.com',
+    ];
+
+    foreach ($emails as $index => $email) {
+        $this->post('/register', [
+            'name' => "Distinct User {$index}",
+            'email' => $email,
+            'password' => 'Password1!@',
+            'password_confirmation' => 'Password1!@',
+        ])
+            ->assertRedirect();
+
+        auth()->logout();
+        $this->flushSession();
+        RateLimiter::clear($registrationIpKey);
+    }
+});