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/vite.config.ts

@@ -0,0 +1,74 @@
+import { sveltekit } from '@sveltejs/kit/vite';
+import { SvelteKitPWA } from '@vite-pwa/sveltekit';
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+	plugins: [
+		sveltekit(),
+		SvelteKitPWA({
+			srcDir: 'src',
+			mode: 'development',
+			strategies: 'generateSW',
+			scope: '/',
+			base: '/',
+			manifest: {
+				name: 'Classeo',
+				short_name: 'Classeo',
+				description: 'Application de gestion scolaire',
+				theme_color: '#3b82f6',
+				background_color: '#ffffff',
+				display: 'standalone',
+				start_url: '/',
+				icons: [
+					{
+						src: 'pwa-192x192.png',
+						sizes: '192x192',
+						type: 'image/png'
+					},
+					{
+						src: 'pwa-512x512.png',
+						sizes: '512x512',
+						type: 'image/png'
+					},
+					{
+						src: 'pwa-512x512.png',
+						sizes: '512x512',
+						type: 'image/png',
+						purpose: 'any maskable'
+					}
+				]
+			},
+			workbox: {
+				globPatterns: ['**/*.{js,css,html,ico,png,svg,webp,woff,woff2}']
+			},
+			devOptions: {
+				enabled: false,
+				type: 'module',
+				navigateFallback: '/'
+			}
+		// eslint-disable-next-line @typescript-eslint/no-explicit-any
+		}) as any
+	],
+	test: {
+		include: ['src/**/*.{test,spec}.{js,ts}', 'tests/**/*.{test,spec}.{js,ts}'],
+		globals: true,
+		environment: 'jsdom',
+		server: {
+			deps: {
+				inline: [/svelte/]
+			}
+		},
+		alias: {
+			$lib: '/src/lib',
+			$app: '/node_modules/@sveltejs/kit/src/runtime/app'
+		}
+	},
+	resolve: {
+		conditions: ['browser']
+	},
+	server: {
+		host: '0.0.0.0',
+		port: 5173,
+		strictPort: true
+	}
+});