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-oas/petstore.yaml

@@ -0,0 +1,96 @@
+openapi: "3.0.0"
+info:
+  title: Petstore API
+  version: "1.0.0"
+  description: API de gestion d'une animalerie
+paths:
+  /pets:
+    get:
+      summary: Liste des animaux
+      operationId: listPets
+      parameters:
+        - name: limit
+          in: query
+          required: false
+          schema:
+            type: integer
+            maximum: 100
+      responses:
+        "200":
+          description: Liste des animaux
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/Pet"
+    post:
+      summary: Créer un animal
+      operationId: createPet
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/NewPet"
+      responses:
+        "201":
+          description: Animal créé
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pet"
+  /pets/{id}:
+    get:
+      summary: Récupérer un animal par ID
+      operationId: getPet
+      parameters:
+        - name: id
+          in: path
+          required: true
+          schema:
+            type: integer
+      responses:
+        "200":
+          description: Animal trouvé
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Pet"
+        "404":
+          description: Animal non trouvé
+    delete:
+      summary: Supprimer un animal
+      operationId: deletePet
+      parameters:
+        - name: id
+          in: path
+          required: true
+          schema:
+            type: integer
+      responses:
+        "204":
+          description: Animal supprimé
+components:
+  schemas:
+    Pet:
+      type: object
+      required:
+        - id
+        - name
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+        tag:
+          type: string
+    NewPet:
+      type: object
+      required:
+        - name
+      properties:
+        name:
+          type: string
+        tag:
+          type: string