fix(models): use snake_case for Eloquent attribute access

Update property access in database components and Application model to
use snake_case conventions (common_name, subject_alternative_names)
for Eloquent attributes. Also add null-safe operators (?->) for
settings access in Application model to handle null values safely.

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

@@ -283,8 +283,8 @@ class General extends Component
             }
 
             SslHelper::generateSslCertificate(
-                commonName: $existingCert->commonName,
-                subjectAlternativeNames: $existingCert->subjectAlternativeNames ?? [],
+                commonName: $existingCert->common_name,
+                subjectAlternativeNames: $existingCert->subject_alternative_names ?? [],
                 resourceType: $existingCert->resource_type,
                 resourceId: $existingCert->resource_id,
                 serverId: $existingCert->server_id,