fix(shared-variables): support direct mount params and comment field for server variables

Allow SharedVariables Livewire components (Environment, Project, Server)
to accept UUID parameters directly via mount() instead of relying solely
on route parameters. This enables Livewire component testing without a
live route context.

Also adds comment field support when saving/updating server shared
environment variables, guards PostgreSQL-specific migration statements
from running under SQLite (test environment compatibility), and expands
the feature test suite with server shared variable scenarios including
inline comment preservation and update behaviour.

app/Livewire/SharedVariables/Server/Show.php

@@ -37,6 +37,7 @@ class Show extends Component
                 'value' => $data['value'],
                 'is_multiline' => $data['is_multiline'],
                 'is_literal' => $data['is_literal'],
+                'comment' => $data['comment'] ?? null,
                 'type' => 'server',
                 'team_id' => currentTeam()->id,
             ]);
@@ -47,9 +48,9 @@ class Show extends Component
         }
     }
 
-    public function mount()
+    public function mount(?string $server_uuid = null)
     {
-        $serverUuid = request()->route('server_uuid');
+        $serverUuid = $server_uuid ?? request()->route('server_uuid');
         $teamId = currentTeam()->id;
         $server = Server::where('team_id', $teamId)->where('uuid', $serverUuid)->first();
         if (! $server) {
@@ -140,7 +141,10 @@ class Show extends Component
     private function updateOrCreateVariables($variables)
     {
         $count = 0;
-        foreach ($variables as $key => $value) {
+        foreach ($variables as $key => $data) {
+            $value = is_array($data) ? ($data['value'] ?? '') : $data;
+            $comment = is_array($data) ? ($data['comment'] ?? null) : null;
+
             // Skip predefined variables
             if (in_array($key, ['COOLIFY_SERVER_UUID', 'COOLIFY_SERVER_NAME'])) {
                 continue;
@@ -149,8 +153,9 @@ class Show extends Component
 
             if ($found) {
                 if (! $found->is_shown_once && ! $found->is_multiline) {
-                    if ($found->value !== $value) {
+                    if ($found->value !== $value || $found->comment !== $comment) {
                         $found->value = $value;
+                        $found->comment = $comment;
                         $found->save();
                         $count++;
                     }
@@ -159,6 +164,7 @@ class Show extends Component
                 $this->server->environment_variables()->create([
                     'key' => $key,
                     'value' => $value,
+                    'comment' => $comment,
                     'is_multiline' => false,
                     'is_literal' => false,
                     'type' => 'server',