First commit of claude's rework in django + vanillajs fronted

apps/calibers/admin.py

@@ -0,0 +1,11 @@
+from django.contrib import admin
+
+from .models import Caliber
+
+
+@admin.register(Caliber)
+class CaliberAdmin(admin.ModelAdmin):
+    list_display = ['name', 'short_name', 'status', 'submitted_by']
+    list_filter = ['status']
+    search_fields = ['name', 'short_name']
+    readonly_fields = ['submitted_by', 'reviewed_by', 'reviewed_at', 'created_at', 'updated_at']