feat: add initial Django domain models

backend/shows/admin.py

@@ -0,0 +1,34 @@
+from django.contrib import admin
+
+from .models import Performance, Show, Venue
+
+
+@admin.register(Show)
+class ShowAdmin(admin.ModelAdmin):
+    list_display = ("title", "slug", "is_published", "created_at", "updated_at")
+    list_filter = ("is_published",)
+    search_fields = ("title", "slug", "summary", "description")
+    prepopulated_fields = {"slug": ("title",)}
+
+
+@admin.register(Venue)
+class VenueAdmin(admin.ModelAdmin):
+    list_display = ("name", "slug", "city", "address", "created_at", "updated_at")
+    list_filter = ("city",)
+    search_fields = ("name", "slug", "address", "city", "notes")
+    prepopulated_fields = {"slug": ("name",)}
+
+
+@admin.register(Performance)
+class PerformanceAdmin(admin.ModelAdmin):
+    list_display = (
+        "show",
+        "venue",
+        "starts_at",
+        "room_capacity",
+        "additional_seats",
+        "manually_occupied_seats",
+        "is_booking_enabled",
+    )
+    list_filter = ("is_booking_enabled", "starts_at", "show", "venue")
+    search_fields = ("show__title", "venue__name", "venue__city")