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/eslint.config.js

@@ -0,0 +1,11 @@
+import mantine from 'eslint-config-mantine';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  ...mantine,
+  { ignores: ['**/*.{mjs,cjs,js,d.ts,d.mts}', './.storybook/main.ts'] },
+  {
+    files: ['**/*.story.tsx'],
+    rules: { 'no-console': 'off' },
+  }
+);