Add daily-stone page showing a different mineral each day

New dailystone app with 207 minerals scraped from Wikipedia.
Each day displays a different mineral with photos, formula,
properties, description, and history. Page theme color matches
the mineral's typical appearance.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dailystone/management/commands/export_minerals.py

@@ -0,0 +1,22 @@
+"""
+Export mineral data as a JSON fixture for loading on the production server.
+
+Usage:
+    python manage.py export_minerals > dailystone/fixtures/minerals.json
+    python manage.py loaddata dailystone/fixtures/minerals.json
+"""
+import json
+import sys
+
+from django.core.management.base import BaseCommand
+from django.core import serializers
+
+from dailystone.models import Mineral
+
+
+class Command(BaseCommand):
+    help = 'Export mineral data as a Django fixture (JSON)'
+
+    def handle(self, *args, **options):
+        data = serializers.serialize('json', Mineral.objects.all(), indent=2)
+        self.stdout.write(data)