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>

SportsTime/Features/Trip/ViewModels/TripCreationViewModel.swift

@@ -58,8 +58,24 @@ final class TripCreationViewModel {
     }
 
     // Dates
-    var startDate: Date = Date()
-    var endDate: Date = Date().addingTimeInterval(86400 * 7)
+    var startDate: Date = Date() {
+        didSet {
+            // Clear cached games when start date changes
+            if !Calendar.current.isDate(startDate, inSameDayAs: oldValue) {
+                availableGames = []
+                games = []
+            }
+        }
+    }
+    var endDate: Date = Date().addingTimeInterval(86400 * 7) {
+        didSet {
+            // Clear cached games when end date changes
+            if !Calendar.current.isDate(endDate, inSameDayAs: oldValue) {
+                availableGames = []
+                games = []
+            }
+        }
+    }
 
     // Trip duration for game-first mode (days before/after selected games)
     var tripBufferDays: Int = 2