feat: add timezone support for stadium-local game times

Adds timeZoneIdentifier to Stadium model and localGameTime/localGameTimeShort
computed properties to RichGame. Game times can now display in venue local
timezone. Also adds timezone field to Python StadiumInfo dataclass with
example entries for Pacific, Central, Mountain, and Toronto timezones.

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

SportsTime/Core/Models/Domain/Game.swift

@@ -91,4 +91,20 @@ struct RichGame: Identifiable, Hashable, Codable {
     var venueDescription: String {
         "\(stadium.name), \(stadium.city)"
     }
+
+    /// Game time formatted in the stadium's local timezone with timezone indicator
+    var localGameTime: String {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "h:mm a z"
+        formatter.timeZone = stadium.timeZone ?? .current
+        return formatter.string(from: game.dateTime)
+    }
+
+    /// Game time formatted in the stadium's local timezone without timezone indicator
+    var localGameTimeShort: String {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "h:mm a"
+        formatter.timeZone = stadium.timeZone ?? .current
+        return formatter.string(from: game.dateTime)
+    }
 }

SportsTime/Core/Models/Domain/Stadium.swift

@@ -17,6 +17,7 @@ struct Stadium: Identifiable, Codable, Hashable {
     let sport: Sport
     let yearOpened: Int?
     let imageURL: URL?
+    let timeZoneIdentifier: String?
 
     init(
         id: String,
@@ -28,7 +29,8 @@ struct Stadium: Identifiable, Codable, Hashable {
         capacity: Int,
         sport: Sport,
         yearOpened: Int? = nil,
-        imageURL: URL? = nil
+        imageURL: URL? = nil,
+        timeZoneIdentifier: String? = nil
     ) {
         self.id = id
         self.name = name
@@ -40,6 +42,11 @@ struct Stadium: Identifiable, Codable, Hashable {
         self.sport = sport
         self.yearOpened = yearOpened
         self.imageURL = imageURL
+        self.timeZoneIdentifier = timeZoneIdentifier
+    }
+
+    var timeZone: TimeZone? {
+        timeZoneIdentifier.flatMap { TimeZone(identifier: $0) }
     }
 
     var location: CLLocation {