Remove CFB/NASCAR/PGA and streamline to 8 supported sports

- Remove College Football, NASCAR, and PGA from scraper and app
- Clean all data files (stadiums, games, pipeline reports)
- Update Sport.swift enum and all UI components
- Add sportstime.py CLI tool for pipeline management
- Add DATA_SCRAPING.md documentation
- Add WNBA/MLS/NWSL implementation documentation
- Scraper now supports: NBA, MLB, NHL, NFL, WNBA, MLS, NWSL, CBB

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Scripts/data/canonicalization_validation.json

@@ -3,10 +3,10 @@
   "error_count": 0,
   "warning_count": 0,
   "summary": {
-    "stadiums": 92,
+    "stadiums": 148,
     "teams": 92,
-    "games": 4972,
-    "aliases": 130,
+    "games": 0,
+    "aliases": 194,
     "by_category": {}
   },
   "errors": []