phase3: add normalized domain schema, admin, services, and multistage docker build

apps/teams/admin.py

@@ -0,0 +1,10 @@
+from django.contrib import admin
+
+from .models import Team
+
+
+@admin.register(Team)
+class TeamAdmin(admin.ModelAdmin):
+    list_display = ("name", "short_name", "country", "is_national_team")
+    list_filter = ("is_national_team", "country")
+    search_fields = ("name", "short_name", "slug")