feat(search): recherche intelligente — parsing backend + pg_trgm fuzzy

- parseSearchTokens() côté backend : extrait type (async/openapi),
  version (v1, 1.2.3) et latestOnly depuis la chaîne brute
- Recherche fuzzy via word_similarity (pg_trgm, seuil 0.5) + ILIKE
- latestOnly automatique quand champ non vide sans version explicite
- Suppression de parseSearch() dans BrowseComponent et CatalogComponent
- Suppression de version/latestOnly de ApiListQuery (géré par le backend)
- Activation de pg_trgm via CREATE EXTENSION dans SeederService
- Tests unitaires Vitest pour parseSearchTokens (24 cas)

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

back/vitest.config.ts

@@ -0,0 +1,9 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+    include: ['src/**/*.spec.ts'],
+  },
+});