refactor: remove mock data and finalize n8n data schema

- Removed all hardcoded MOCK_ATTENDANCES, USERS, and TENANTS generators from constants.ts since the system is now production-ready.

- Renamed 'summary' to 'title' in the database and across all frontend components for clarity.

- Added 'full_summary' to the attendances schema to explicitly store the large, detailed AI analysis texts from n8n.

- Updated the 'Resumo da Interação' UI to render the 'full_summary' without adding any artificial filler text.

- Localized all dates and times across the dashboard to Brazilian formatting (pt-BR).

pages/ApiKeys.tsx

@@ -169,7 +169,7 @@ export const ApiKeys: React.FC = () => {
                     </td>
                     <td className="py-3 px-4 text-sm font-mono text-zinc-500 dark:text-zinc-400">{key.masked_key}</td>
                     <td className="py-3 px-4 text-xs text-zinc-500 dark:text-zinc-400">
-                      {key.last_used_at ? new Date(key.last_used_at).toLocaleString() : 'Nunca'}
+                      {key.last_used_at ? new Date(key.last_used_at).toLocaleString('pt-BR') : 'Nunca'}
                     </td>
                     <td className="py-3 px-4 text-right">
                       <button