fix(audit): remover response_format para openrouter e melhorar placeholder

app/src/components/AuditPanel.tsx

@@ -161,7 +161,7 @@ export default function AuditPanel() {
               <Input
                 value={config.baseUrl ?? ''}
                 onChange={(e) => setConfig((c) => ({ ...c, baseUrl: e.target.value || undefined }))}
-                placeholder="https://api.openai.com/v1"
+                placeholder={config.provider === 'openrouter' ? 'https://openrouter.ai/api/v1 (padrão)' : config.provider === 'ollama' ? 'http://localhost:11434 (padrão)' : 'https://api.openai.com/v1'}
               />
             </div>
           </div>

app/src/lib/audit/runner.ts

@@ -147,23 +147,28 @@ async function callOpenRouter(
 ): Promise<string> {
   onProgress?.('Enviando para OpenRouter...');
   const url = config.baseUrl ?? 'https://openrouter.ai/api/v1/chat/completions';
-  const body: OpenAIRequest = {
+  const body = {
     model: config.model,
     messages: [
-      { role: 'system', content: systemPrompt },
-      { role: 'user', content: userPrompt },
+      { role: 'system' as const, content: systemPrompt },
+      { role: 'user' as const, content: userPrompt },
     ],
     temperature: 0,
-    response_format: { type: 'json_object' },
   };
   const response = await fetchWithTimeout(url, {
     method: 'POST',
     headers: {
       'Content-Type': 'application/json',
       'Authorization': `Bearer ${config.apiKey}`,
+      'HTTP-Referer': 'https://brainwind.app',
+      'X-Title': 'BrainWind NBR 6123',
     },
     body: JSON.stringify(body),
   }, 180000);
+  if (!response.ok) {
+    const errText = await response.text();
+    throw new Error(`OpenRouter HTTP ${response.status}: ${errText}`);
+  }
   const data = await response.json() as { choices?: { message?: { content?: string } }[]; error?: { message?: string } };
   if (data.error) throw new Error(`OpenRouter error: ${data.error.message}`);
   const content = data.choices?.[0]?.message?.content;