M0: scaffold SPA + API monorepo

Backend (Django 6.1 + DRF):
- Token auth with a custom User model (register/login/logout/me)
- Library models (MediaItem, MediaLocation) and REST endpoints
- File list/detail with search, rating filter, sorting, pagination
- Multipart upload with optional rating/tags/notes
- Range-aware media serving (video seeking) and ffmpeg thumbnails
- scan_files management command for the watched folder

Frontend (React 19 + Vite + TypeScript):
- Catppuccin Mocha design tokens from the design docs
- App shell, token persistence, protected routes
- Library grid with filters, file detail with custom data editor
- Upload page with per-file progress via XHR
- Dev proxy to the Django API

backend/apps/accounts/urls.py

@@ -0,0 +1,11 @@
+from django.urls import path
+from rest_framework.authtoken.views import obtain_auth_token
+
+from .views import LogoutView, MeView, RegisterView
+
+urlpatterns = [
+    path("register/", RegisterView.as_view(), name="register"),
+    path("token/", obtain_auth_token, name="login"),
+    path("logout/", LogoutView.as_view(), name="logout"),
+    path("me/", MeView.as_view(), name="me"),
+]