✨(frontend) set up Vite-based frontend project

Chose Vite for static output efficiency, aligning with project needs.

All API interactions are currently unauthenticated. SSO support
planned soon, using ProConnect.

UX is minimalistic, and showcases the core idea.

Components introduced:
* AppProvider
* Select and TextArea Rhf inputs

API hooks introduced:
* useGeneratePDF, generates a PDF, and downloads it in the client.
* useTemplates, fetches available templates to populate Select options.

src/backend/core/urls.py

@@ -1,8 +1,10 @@
 """URL configuration for the core app."""
 from django.urls import path
 
-from core.views import generate_document
+from core.views import generate_document, TemplatesApiView, GenerateDocumentAPIView
 
 urlpatterns = [
     path('generate-document/', generate_document, name='generate_document'),
+    path('api/generate-document/', GenerateDocumentAPIView.as_view(), name='generate-document'),
+    path('api/templates', TemplatesApiView.as_view()),
 ]