feat(browse): gestion CRUD des dossiers depuis la page Browse

- Ajout boutons Modifier/Supprimer sur chaque tuile de dossier
- Supprimer visible uniquement si dossier vide (0 APIs, 0 sous-dossiers)
- Modale Angular (sans fr-modal DSFR) pour créer/éditer un dossier
- Backend: remove() lève BadRequestException si dossier non vide
- Ajout fichiers YAML de démo (OpenAPI Petstore, AsyncAPI User Events)

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>

documentation/files-samples-asyncapi/user-events.yaml

@@ -0,0 +1,101 @@
+asyncapi: "3.0.0"
+info:
+  title: User Events API
+  version: "1.0.0"
+  description: API événementielle pour les actions utilisateurs
+channels:
+  userSignedUp:
+    address: user.signed.up
+    messages:
+      userSignedUp:
+        $ref: "#/components/messages/UserSignedUp"
+  userLoggedIn:
+    address: user.logged.in
+    messages:
+      userLoggedIn:
+        $ref: "#/components/messages/UserLoggedIn"
+  orderPlaced:
+    address: order.placed
+    messages:
+      orderPlaced:
+        $ref: "#/components/messages/OrderPlaced"
+operations:
+  onUserSignedUp:
+    action: receive
+    channel:
+      $ref: "#/channels/userSignedUp"
+  onUserLoggedIn:
+    action: receive
+    channel:
+      $ref: "#/channels/userLoggedIn"
+  onOrderPlaced:
+    action: receive
+    channel:
+      $ref: "#/channels/orderPlaced"
+components:
+  messages:
+    UserSignedUp:
+      name: UserSignedUp
+      title: Utilisateur inscrit
+      summary: Émis lorsqu'un utilisateur crée un compte
+      payload:
+        type: object
+        required:
+          - userId
+          - email
+          - createdAt
+        properties:
+          userId:
+            type: string
+            format: uuid
+          email:
+            type: string
+            format: email
+          createdAt:
+            type: string
+            format: date-time
+    UserLoggedIn:
+      name: UserLoggedIn
+      title: Utilisateur connecté
+      summary: Émis lorsqu'un utilisateur se connecte
+      payload:
+        type: object
+        required:
+          - userId
+          - loginAt
+        properties:
+          userId:
+            type: string
+            format: uuid
+          loginAt:
+            type: string
+            format: date-time
+    OrderPlaced:
+      name: OrderPlaced
+      title: Commande passée
+      summary: Émis lorsqu'une commande est créée
+      payload:
+        type: object
+        required:
+          - orderId
+          - userId
+          - total
+        properties:
+          orderId:
+            type: string
+            format: uuid
+          userId:
+            type: string
+            format: uuid
+          total:
+            type: number
+            format: float
+          items:
+            type: array
+            items:
+              type: object
+              properties:
+                productId:
+                  type: string
+                quantity:
+                  type: integer