feat: add Django web app, CloudKit sync, dashboard, and game_datetime_utc export

Adds the full Django application layer on top of sportstime_parser:
- core: Sport, Team, Stadium, Game models with aliases and league structure
- scraper: orchestration engine, adapter, job management, Celery tasks
- cloudkit: CloudKit sync client, sync state tracking, sync jobs
- dashboard: staff dashboard for monitoring scrapers, sync, review queue
- notifications: email reports for scrape/sync results
- Docker setup for deployment (Dockerfile, docker-compose, entrypoint)

Game exports now use game_datetime_utc (ISO 8601 UTC) instead of
venue-local date+time strings, matching the canonical format used
by the iOS app.

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

docker-entrypoint.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+set -e
+
+# Wait for database to be ready
+echo "Waiting for PostgreSQL..."
+while ! nc -z $POSTGRES_HOST ${POSTGRES_PORT:-5432}; do
+  sleep 1
+done
+echo "PostgreSQL is ready!"
+
+# Run migrations
+echo "Running migrations..."
+python manage.py migrate --noinput
+
+# Collect static files (skip in DEBUG mode - Django serves them directly)
+if [ "$DEBUG" != "True" ]; then
+    echo "Collecting static files..."
+    python manage.py collectstatic --noinput
+else
+    echo "DEBUG mode - skipping collectstatic"
+fi
+
+# Create superuser if not exists
+if [ -n "$DJANGO_SUPERUSER_USERNAME" ] && [ -n "$DJANGO_SUPERUSER_PASSWORD" ] && [ -n "$DJANGO_SUPERUSER_EMAIL" ]; then
+    echo "Creating superuser..."
+    python manage.py shell << EOF
+from django.contrib.auth import get_user_model
+User = get_user_model()
+if not User.objects.filter(username='$DJANGO_SUPERUSER_USERNAME').exists():
+    User.objects.create_superuser('$DJANGO_SUPERUSER_USERNAME', '$DJANGO_SUPERUSER_EMAIL', '$DJANGO_SUPERUSER_PASSWORD')
+    print('Superuser created successfully')
+else:
+    print('Superuser already exists')
+EOF
+fi
+
+# Import initial data if flag is set
+if [ "$IMPORT_INITIAL_DATA" = "true" ]; then
+    echo "Importing initial data..."
+    python manage.py import_data --data-dir=/app --output-dir=/app/output || true
+fi
+
+# Start the server
+echo "Starting server..."
+exec "$@"