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/library/admin.py

@@ -0,0 +1,23 @@
+from django.contrib import admin
+
+from .models import MediaItem, MediaLocation
+
+
+class MediaLocationInline(admin.TabularInline):
+    model = MediaLocation
+    extra = 0
+    readonly_fields = ("path", "rel_path", "mtime")
+
+
+@admin.register(MediaItem)
+class MediaItemAdmin(admin.ModelAdmin):
+    list_display = ("md5", "size", "rating", "created_at")
+    list_filter = ("rating",)
+    search_fields = ("md5",)
+    inlines = [MediaLocationInline]
+
+
+@admin.register(MediaLocation)
+class MediaLocationAdmin(admin.ModelAdmin):
+    list_display = ("rel_path", "item", "mtime")
+    search_fields = ("rel_path", "path")