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>

core/models/__init__.py

@@ -0,0 +1,17 @@
+from .sport import Sport
+from .league_structure import Conference, Division
+from .team import Team
+from .stadium import Stadium
+from .game import Game
+from .alias import TeamAlias, StadiumAlias
+
+__all__ = [
+    'Sport',
+    'Conference',
+    'Division',
+    'Team',
+    'Stadium',
+    'Game',
+    'TeamAlias',
+    'StadiumAlias',
+]