feat(api-detail): navigation entre versions + bouton nouvelle version

- GET /api/apis/:id/versions — retourne toutes les versions du même API
  (même name + convention), triées par version DESC
- Sélecteur DSFR sur la page détail quand plusieurs versions existent ;
  changement de version navigue vers /catalog/:newId en rechargeant
  le composant via abonnement à paramMap (fix réutilisation instance Angular)
- Bouton "Nouvelle version" → /upload?from=:id avec pré-remplissage du
  formulaire (convention, name, provider, contacts, version patch+1)
- Seeder : 2 versions démo supplémentaires de "Référentiel Produits"
  (v3.0.3, v3.0.2) pour tester le sélecteur
- Fix import ApiStatus manquant dans apis.service.ts

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/api-detail/api-detail.component.ts

@@ -9,9 +9,10 @@ import {
 } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { ActivatedRoute, Router, RouterLink } from '@angular/router';
+import { Subscription } from 'rxjs';
 import { ApiService } from '../../core/api.service';
 import { CategoryService } from '../../core/category.service';
-import { ApiEntry, Category, ApiConvention } from '@datacat/shared';
+import { ApiEntry, ApiEntryListItem, Category, ApiConvention } from '@datacat/shared';
 
 @Component({
   selector: 'app-api-detail',
@@ -63,6 +64,16 @@ import { ApiEntry, Category, ApiConvention } from '@datacat/shared';
               <span class="fr-tag">v{{ entry.version }}</span>
               <span [class]="badgeClass(entry.status)">{{ entry.status }}</span>
             </div>
+            @if (versions().length > 1) {
+              <div class="fr-select-group fr-mt-2w" style="max-width:200px">
+                <label class="fr-label" for="version-select">Version</label>
+                <select class="fr-select" id="version-select" (change)="onVersionChange($event)">
+                  @for (v of versions(); track v.id) {
+                    <option [value]="v.id" [selected]="v.id === entry.id">{{ v.version }}</option>
+                  }
+                </select>
+              </div>
+            }
           </div>
         </div>
 
@@ -155,6 +166,9 @@ import { ApiEntry, Category, ApiConvention } from '@datacat/shared';
           <button class="fr-btn fr-btn--secondary" (click)="openEdit()">
             Modifier
           </button>
+          <button class="fr-btn fr-btn--secondary fr-btn--icon-left fr-icon-add-line" (click)="onNewVersion()">
+            Nouvelle version
+          </button>
           <a
             [href]="'/api/apis/' + entry.id + '/yaml'"
             class="fr-btn fr-btn--secondary"
@@ -354,6 +368,7 @@ export class ApiDetailComponent implements OnInit, OnDestroy {
   private categoryService = inject(CategoryService);
 
   api = signal<ApiEntry | null>(null);
+  versions = signal<ApiEntryListItem[]>([]);
   categoryBreadcrumb = signal<Category[]>([]);
   loading = signal(false);
   error = signal<string | null>(null);
@@ -388,17 +403,37 @@ export class ApiDetailComponent implements OnInit, OnDestroy {
   });
 
   private pollInterval: ReturnType<typeof setInterval> | null = null;
+  private routeSub: Subscription | null = null;
   private id = '';
 
   ngOnInit() {
-    this.id = this.route.snapshot.paramMap.get('id') ?? '';
-    this.loadApi();
+    this.routeSub = this.route.paramMap.subscribe((params) => {
+      this.id = params.get('id') ?? '';
+      this.api.set(null);
+      this.versions.set([]);
+      this.error.set(null);
+      this.categoryBreadcrumb.set([]);
+      this.clearPoll();
+      this.loadApi();
+    });
   }
 
   ngOnDestroy() {
+    this.routeSub?.unsubscribe();
     this.clearPoll();
   }
 
+  onVersionChange(event: Event): void {
+    const id = (event.target as HTMLSelectElement).value;
+    if (id && id !== this.api()?.id) {
+      this.router.navigate(['/catalog', id]);
+    }
+  }
+
+  onNewVersion(): void {
+    this.router.navigate(['/upload'], { queryParams: { from: this.api()?.id } });
+  }
+
   onRegenerate() {
     this.regenerating.set(true);
     this.apiService.regenerate(this.id).subscribe({
@@ -494,6 +529,10 @@ export class ApiDetailComponent implements OnInit, OnDestroy {
         this.api.set(entry);
         this.loading.set(false);
         this.startPollIfPending();
+        this.apiService.getVersions(this.id).subscribe({
+          next: (v) => this.versions.set(v),
+          error: () => {},
+        });
         if (entry.categoryId) {
           this.categoryService.browse(entry.categoryId).subscribe({
             next: (data) => this.categoryBreadcrumb.set(data.breadcrumb),