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>

sportstime_parser/scrapers/mls.py

@@ -27,7 +27,11 @@ class MLSScraper(BaseScraper):
 
     Sources (in priority order):
     1. ESPN API - Most reliable for MLS
-    2. FBref - Backup option
+    2. FBref - Backup option (not implemented)
+
+    Source Timezones:
+    - espn: UTC - ISO 8601 format with "Z" suffix
+    - fbref: Not implemented
     """
 
     def __init__(self, season: int, **kwargs):
@@ -387,6 +391,7 @@ class MLSScraper(BaseScraper):
                 country=info.country,
                 latitude=info.latitude,
                 longitude=info.longitude,
+                timezone=info.timezone,
                 surface="grass",
                 roof_type="open",
             )