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>

requirements.txt

@@ -1,15 +1,43 @@
-# Core dependencies
+# Django
+Django>=5.1,<5.2
+gunicorn>=21.2.0
+whitenoise>=6.6.0
+
+# Database
+psycopg2-binary>=2.9.9
+dj-database-url>=2.1.0
+
+# Celery
+celery>=5.3.6
+redis>=5.0.1
+django-celery-beat>=2.6.0
+django-celery-results>=2.5.1
+
+# Audit Trail
+django-simple-history>=3.4.0
+
+# Import/Export
+django-import-export>=4.0.0
+
+# Scraping (existing dependencies)
 requests>=2.31.0
 beautifulsoup4>=4.12.0
 lxml>=5.0.0
 rapidfuzz>=3.5.0
 python-dateutil>=2.8.0
 pytz>=2024.1
-rich>=13.7.0
+timezonefinder>=6.2.0
+
+# CloudKit Authentication
 pyjwt>=2.8.0
 cryptography>=42.0.0
 
-# Development dependencies
+# Utilities
+python-dotenv>=1.0.0
+rich>=13.7.0
+
+# Development
 pytest>=8.0.0
 pytest-cov>=4.1.0
+pytest-django>=4.7.0
 responses>=0.25.0