fix(server): share SSH username validation

Centralize SSH username rules and sanitization so dotted usernames are
accepted consistently across API, onboarding, and Livewire server forms.

app/Livewire/Boarding/Index.php

@@ -8,6 +8,7 @@ use App\Models\Project;
 use App\Models\Server;
 use App\Models\Team;
 use App\Services\ConfigurationRepository;
+use App\Support\ValidationPatterns;
 use Illuminate\Support\Collection;
 use Livewire\Attributes\Url;
 use Livewire\Component;
@@ -278,7 +279,7 @@ class Index extends Component
             'remoteServerName' => 'required|string',
             'remoteServerHost' => 'required|string',
             'remoteServerPort' => 'required|integer',
-            'remoteServerUser' => 'required|string|regex:/^[a-zA-Z0-9._-]+$/',
+            'remoteServerUser' => ValidationPatterns::serverUsernameRules(),
         ]);
 
         $this->privateKey = formatPrivateKey($this->privateKey);
@@ -467,7 +468,7 @@ class Index extends Component
     {
         $this->validate([
             'remoteServerPort' => 'required|integer|min:1|max:65535',
-            'remoteServerUser' => 'required|string|regex:/^[a-zA-Z0-9._-]+$/',
+            'remoteServerUser' => ValidationPatterns::serverUsernameRules(),
         ]);
 
         $this->createdServer->update([

app/Livewire/Server/New/ByIp.php

@@ -57,7 +57,7 @@ class ByIp extends Component
             'name' => ValidationPatterns::nameRules(),
             'description' => ValidationPatterns::descriptionRules(),
             'ip' => ['required', 'string', new ValidServerIp],
-            'user' => ['required', 'string', 'regex:/^[a-zA-Z0-9._-]+$/'],
+            'user' => ValidationPatterns::serverUsernameRules(),
             'port' => 'required|integer|between:1,65535',
             'is_build_server' => 'required|boolean',
         ];
@@ -75,6 +75,7 @@ class ByIp extends Component
             'ip.string' => 'The IP Address/Domain must be a string.',
             'user.required' => 'The User field is required.',
             'user.string' => 'The User field must be a string.',
+            ...ValidationPatterns::serverUsernameMessages(),
             'port.required' => 'The Port field is required.',
             'port.integer' => 'The Port field must be an integer.',
             'port.between' => 'The Port field must be between 1 and 65535.',

app/Livewire/Server/Show.php

@@ -110,7 +110,7 @@ class Show extends Component
             'name' => ValidationPatterns::nameRules(),
             'description' => ValidationPatterns::descriptionRules(),
             'ip' => ['required', new ValidServerIp],
-            'user' => ['required', 'regex:/^[a-zA-Z0-9._-]+$/'],
+            'user' => ValidationPatterns::serverUsernameRules(),
             'port' => 'required|integer|between:1,65535',
             'connectionTimeout' => 'required|integer|min:1|max:300',
             'validationLogs' => 'nullable',
@@ -140,6 +140,7 @@ class Show extends Component
             [
                 'ip.required' => 'The IP Address field is required.',
                 'user.required' => 'The User field is required.',
+                ...ValidationPatterns::serverUsernameMessages(),
                 'port.required' => 'The Port field is required.',
                 'connectionTimeout.required' => 'The SSH Connection Timeout field is required.',
                 'connectionTimeout.integer' => 'The SSH Connection Timeout must be an integer.',