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>

.env.example

@@ -0,0 +1,45 @@
+# Django Settings
+DEBUG=False
+SECRET_KEY=generate-a-secure-key-with-python-c-from-django.core.management.utils-import-get_random_secret_key-print-get_random_secret_key
+ALLOWED_HOSTS=sportstime.yourdomain.com,localhost,127.0.0.1
+
+# Admin User (created on first startup)
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=changeme
+ADMIN_EMAIL=admin@yourdomain.com
+
+# Import initial data on first startup (set to true, then false after first run)
+IMPORT_INITIAL_DATA=true
+
+# Database
+DB_PASSWORD=your-secure-database-password
+DATABASE_URL=postgresql://sportstime:${DB_PASSWORD}@db:5432/sportstime
+
+# Redis
+REDIS_URL=redis://redis:6379/0
+
+# CloudKit Configuration
+CLOUDKIT_CONTAINER=iCloud.com.sportstime.app
+CLOUDKIT_ENVIRONMENT=development
+CLOUDKIT_KEY_ID=your-cloudkit-key-id
+CLOUDKIT_PRIVATE_KEY_PATH=/app/secrets/cloudkit.pem
+
+# Email (SMTP) - Example for Gmail
+EMAIL_HOST=smtp.gmail.com
+EMAIL_PORT=587
+EMAIL_USE_TLS=True
+EMAIL_HOST_USER=your-email@gmail.com
+EMAIL_HOST_PASSWORD=your-app-specific-password
+DEFAULT_FROM_EMAIL=SportsTime <noreply@yourdomain.com>
+ADMIN_EMAIL=admin@yourdomain.com
+
+# Security (for production behind HTTPS proxy)
+SECURE_SSL_REDIRECT=False
+CSRF_TRUSTED_ORIGINS=https://sportstime.yourdomain.com
+SESSION_COOKIE_SECURE=True
+CSRF_COOKIE_SECURE=True
+
+# Scraper Settings
+SCRAPER_REQUEST_DELAY=3.0
+SCRAPER_MAX_RETRIES=3
+SCRAPER_FUZZY_THRESHOLD=85