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/components/ColorSchemeToggle/ColorSchemeToggle.tsx

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+import { Button, Group, useMantineColorScheme } from '@mantine/core';
+
+export function ColorSchemeToggle() {
+  const { setColorScheme } = useMantineColorScheme();
+
+  return (
+    <Group justify="center" mt="xl">
+      <Button onClick={() => setColorScheme('light')}>Light</Button>
+      <Button onClick={() => setColorScheme('dark')}>Dark</Button>
+      <Button onClick={() => setColorScheme('auto')}>Auto</Button>
+    </Group>
+  );
+}

frontend/src/components/Welcome/Welcome.module.css

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+.title {
+  color: light-dark(var(--mantine-color-black), var(--mantine-color-white));
+  font-size: rem(100px);
+  font-weight: 900;
+  letter-spacing: rem(-2px);
+
+  @media (max-width: $mantine-breakpoint-md) {
+    font-size: rem(50px);
+  }
+}

frontend/src/components/Welcome/Welcome.story.tsx

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+import { Welcome } from './Welcome';
+
+export default {
+  title: 'Welcome',
+};
+
+export const Usage = () => <Welcome />;

frontend/src/components/Welcome/Welcome.test.tsx

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+import { render, screen } from '@test-utils';
+import { Welcome } from './Welcome';
+
+describe('Welcome component', () => {
+  it('has correct Vite guide link', () => {
+    render(<Welcome />);
+    expect(screen.getByText('this guide')).toHaveAttribute(
+      'href',
+      'https://mantine.dev/guides/vite/'
+    );
+  });
+});

frontend/src/components/Welcome/Welcome.tsx

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+import { Anchor, Text, Title } from '@mantine/core';
+import classes from './Welcome.module.css';
+
+export function Welcome() {
+  return (
+    <>
+      <Title className={classes.title} ta="center" mt={100}>
+        Welcome to{' '}
+        <Text inherit variant="gradient" component="span" gradient={{ from: 'pink', to: 'yellow' }}>
+          Mantine
+        </Text>
+      </Title>
+      <Text c="dimmed" ta="center" size="lg" maw={580} mx="auto" mt="xl">
+        This starter Vite project includes a minimal setup, if you want to learn more on Mantine +
+        Vite integration follow{' '}
+        <Anchor href="https://mantine.dev/guides/vite/" size="lg">
+          this guide
+        </Anchor>
+        . To get started edit pages/Home.page.tsx file.
+      </Text>
+    </>
+  );
+}