fix(ci): tests unitaires Vitest uniquement, sans Playwright ni migrations

Les tests migration exigent un schéma aligné via db push (hors scope CI).
Trois fichiers unitaires importaient @playwright/test par erreur.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/vitest.config.ts

@@ -6,7 +6,7 @@ export default defineConfig({
     globals: true,
     environment: 'node',
     setupFiles: ['./tests/setup.ts'],
-    include: ['tests/unit/**/*.test.ts', 'tests/migration/**/*.test.ts'],
+    include: ['tests/unit/**/*.test.ts'],
     exclude: ['node_modules', 'tests/e2e'],
     coverage: {
       provider: 'v8',