feat: Setup projet Classeo avec infrastructure Docker et architecture DDD

Configure l'environnement de développement complet avec Docker Compose,
structure DDD 4 Bounded Contexts, et pipeline CI/CD GitHub Actions.

Corrections compatibilité CI:
- Symfony 8 nécessite monolog-bundle ^4.0 (la v3.x ne supporte que jusqu'à Symfony 7)
- ESLint v9 nécessite flat config (eslint.config.js) - le format .eslintrc.cjs est obsolète

frontend/tests/unit/example.test.ts

@@ -0,0 +1,21 @@
+import { describe, it, expect } from 'vitest';
+
+describe('Math operations', () => {
+	it('should add two numbers correctly', () => {
+		expect(1 + 1).toBe(2);
+	});
+
+	it('should multiply two numbers correctly', () => {
+		expect(2 * 3).toBe(6);
+	});
+});
+
+describe('String operations', () => {
+	it('should concatenate strings', () => {
+		expect('Hello' + ' ' + 'World').toBe('Hello World');
+	});
+
+	it('should convert to uppercase', () => {
+		expect('classeo'.toUpperCase()).toBe('CLASSEO');
+	});
+});

frontend/tests/unit/page.test.ts

@@ -0,0 +1,23 @@
+import { render, screen } from '@testing-library/svelte';
+import { describe, expect, it } from 'vitest';
+import Page from '../../src/routes/+page.svelte';
+
+describe('Home Page', () => {
+	it('renders the welcome message', () => {
+		render(Page);
+
+		expect(screen.getByRole('heading', { name: 'Bienvenue sur Classeo' })).toBeTruthy();
+	});
+
+	it('renders the description', () => {
+		render(Page);
+
+		expect(screen.getByText('Application de gestion scolaire')).toBeTruthy();
+	});
+
+	it('starts counter at 0', () => {
+		render(Page);
+
+		expect(screen.getByText('Compteur: 0')).toBeTruthy();
+	});
+});