Add OpenAI and PostgreSQL credential management

- Implemented OpenAICredencial class for managing OpenAI API keys.
- Created OpenAICredencialModel and OpenAICredencialMapper for SQLAlchemy integration.
- Developed OpenAICredencialRepo for CRUD operations on OpenAI credentials.
- Established OpenAICliente class for interacting with OpenAI API.
- Introduced PostgresCredencial class for managing PostgreSQL connection details.
- Created PostgresCredencialModel and PostgresCredencialMapper for SQLAlchemy integration.
- Developed PostgresCredencialRepo for CRUD operations on PostgreSQL credentials.
- Added base connection class and PostgreSQL connection implementation.
- Included environment variable loading for sensitive data management.

frontend/src/Router.tsx

@@ -0,0 +1,13 @@
+import { createBrowserRouter, RouterProvider } from 'react-router-dom';
+import { HomePage } from './pages/Home.page';
+
+const router = createBrowserRouter([
+  {
+    path: '/',
+    element: <HomePage />,
+  },
+]);
+
+export function Router() {
+  return <RouterProvider router={router} />;
+}