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>

front-public/src/app/pages/browse/browse.component.ts

@@ -74,7 +74,7 @@ import { CategoryDeleteModalComponent } from '../../shared/category-delete-modal
       <!-- Barre de recherche -->
       <div class="fr-search-bar fr-mb-3w">
         <label class="fr-label" for="search-api">Rechercher</label>
-        <input id="search-api" class="fr-input" type="search" placeholder="Titre, description..."
+        <input id="search-api" class="fr-input" type="search" placeholder="Ex : auth async v1.0, openapi latest..."
                [value]="searchQuery()"
                (input)="onSearchChange($any($event.target).value)" />
       </div>
@@ -365,10 +365,11 @@ export class BrowseComponent implements OnInit {
 
   loadSearch() {
     this.searchLoading.set(true);
-    const q = this.searchQuery().trim().toLowerCase();
+    const raw = this.searchQuery();
+    const q = raw.trim().toLowerCase();
 
     forkJoin({
-      apis: this.apiService.list({ search: this.searchQuery(), page: this.searchPage(), limit: this.searchLimit }),
+      apis: this.apiService.list({ search: raw || undefined, page: this.searchPage(), limit: this.searchLimit }),
       categories: this.categoryService.list(),
     }).subscribe({
       next: ({ apis, categories }) => {
@@ -376,9 +377,7 @@ export class BrowseComponent implements OnInit {
         this.searchTotal.set(apis.total);
         this.searchCategoryResults.set(
           categories.items.filter(
-            (c) =>
-              c.name.toLowerCase().includes(q) ||
-              (c.description ?? '').toLowerCase().includes(q),
+            (c) => c.name.toLowerCase().includes(q) || (c.description ?? '').toLowerCase().includes(q),
           ),
         );
         this.searchLoading.set(false);

front-public/src/app/pages/catalog/catalog.component.ts

@@ -41,7 +41,7 @@ import { ApiEntryListItem, ApiType } from '@datacat/shared';
               id="search-input"
               class="fr-input"
               type="search"
-              placeholder="Rechercher par titre ou description..."
+              placeholder="Ex : auth async v1.0, openapi latest..."
               [ngModel]="search()"
               (ngModelChange)="onSearchChange($event)"
             />