feat: complete delta sync implementation - add allGames, update callers

- Add allRichGames method to DataProvider
- Update TripCreationViewModel.loadGamesForBrowsing to use allGames (removes 90-day limit)
- Update MockCloudKitService sync methods to use new delta sync signatures
- Update MockAppDataProvider with renamed methods and new allGames/allRichGames
- Fix all callers: ScheduleViewModel, TripCreationViewModel, SuggestedTripsGenerator, GameMatcher
- Update CLAUDE.md documentation with new method names

This completes the delta sync implementation:
- CloudKit sync now uses modificationDate for proper delta sync
- First sync fetches ALL data, subsequent syncs only fetch modified records
- "By Games" mode now shows all available games (not just 90 days)
- All data types (stadiums, teams, games) use consistent delta sync pattern

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

SportsTime/Core/Services/DataProvider.swift

@@ -197,6 +197,20 @@ final class AppDataProvider: ObservableObject {
         }
     }
 
+    /// Get all games with full team and stadium data (no date filtering)
+    func allRichGames(for sports: Set<Sport>) async throws -> [RichGame] {
+        let games = try await allGames(for: sports)
+
+        return games.compactMap { game in
+            guard let homeTeam = teamsById[game.homeTeamId],
+                  let awayTeam = teamsById[game.awayTeamId],
+                  let stadium = stadiumsById[game.stadiumId] else {
+                return nil
+            }
+            return RichGame(game: game, homeTeam: homeTeam, awayTeam: awayTeam, stadium: stadium)
+        }
+    }
+
     func richGame(from game: Game) -> RichGame? {
         guard let homeTeam = teamsById[game.homeTeamId],
               let awayTeam = teamsById[game.awayTeamId],