fix(database): auto-generate missing CA cert on SSL regeneration

Prevent null CA certificate access during database SSL certificate regeneration
across KeyDB, MariaDB, MongoDB, MySQL, PostgreSQL, and Redis components.

If no CA certificate exists, attempt to generate one and re-query; if still
missing, dispatch a clear error and stop regeneration gracefully.

Add `SslCertificateRegenerationTest` coverage for missing-CA and CA-query
scenarios to prevent regressions.

app/Livewire/Project/Database/Keydb/General.php

@@ -269,6 +269,17 @@ class General extends Component
                 ->where('is_ca_certificate', true)
                 ->first();
 
+            if (! $caCert) {
+                $this->server->generateCaCertificate();
+                $caCert = $this->server->sslCertificates()->where('is_ca_certificate', true)->first();
+            }
+
+            if (! $caCert) {
+                $this->dispatch('error', 'No CA certificate found for this database. Please generate a CA certificate for this server in the server/advanced page.');
+
+                return;
+            }
+
             SslHelper::generateSslCertificate(
                 commonName: $existingCert->commonName,
                 subjectAlternativeNames: $existingCert->subjectAlternativeNames ?? [],