Add oauth field to OpenCode Nightwatch MCP config

Add empty oauth object to OpenCode httpMcpServerConfig to properly support Nightwatch MCP authentication. Uses stdClass to ensure it serializes as {} in JSON rather than being filtered out as an empty array.

Author: DGarbs51

src/Install/Agents/OpenCode.php

@@ -76,6 +76,7 @@ public function httpMcpServerConfig(string $url): array
             'type' => 'remote',
             'enabled' => true,
             'url' => $url,
+            'oauth' => new \stdClass,
         ];
     }
 

tests/Unit/Install/Agents/OpenCodeTest.php

@@ -15,9 +15,12 @@
 test('httpMcpServerConfig returns remote type config', function (): void {
     $agent = new OpenCode($this->strategyFactory);
 
-    expect($agent->httpMcpServerConfig('https://nightwatch.laravel.com/mcp'))->toBe([
+    $config = $agent->httpMcpServerConfig('https://nightwatch.laravel.com/mcp');
+
+    expect($config)->toMatchArray([
         'type' => 'remote',
         'enabled' => true,
         'url' => 'https://nightwatch.laravel.com/mcp',
     ]);
+    expect(json_encode($config['oauth']))->toBe('{}');
 });