chore: remove college basketball (CBB) from iOS app

Remove CBB (~5,000+ games per season) to reduce complexity.

Changes:
- Remove .cbb enum case from Sport
- Remove CBB theme color (cbbMint)
- Update documentation to reflect 7 supported leagues

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

SportsTime/Core/Models/Domain/Sport.swift

@@ -14,7 +14,6 @@ enum Sport: String, Codable, CaseIterable, Identifiable {
     case mls = "MLS"
     case wnba = "WNBA"
     case nwsl = "NWSL"
-    case cbb = "CBB"
 
     var id: String { rawValue }
 
@@ -27,7 +26,6 @@ enum Sport: String, Codable, CaseIterable, Identifiable {
         case .mls: return "Major League Soccer"
         case .wnba: return "Women's National Basketball Association"
         case .nwsl: return "National Women's Soccer League"
-        case .cbb: return "College Basketball"
         }
     }
 
@@ -40,7 +38,6 @@ enum Sport: String, Codable, CaseIterable, Identifiable {
         case .mls: return "soccerball"
         case .wnba: return "basketball.fill"
         case .nwsl: return "soccerball"
-        case .cbb: return "basketball.fill"
         }
     }
 
@@ -53,7 +50,6 @@ enum Sport: String, Codable, CaseIterable, Identifiable {
         case .mls: return .green
         case .wnba: return .purple
         case .nwsl: return .teal
-        case .cbb: return .mint
         }
     }
 
@@ -67,7 +63,6 @@ enum Sport: String, Codable, CaseIterable, Identifiable {
         case .mls: return (2, 12)   // February - December
         case .wnba: return (5, 10)  // May - October
         case .nwsl: return (3, 11)  // March - November
-        case .cbb: return (11, 4)   // November - April (wraps, March Madness)
         }
     }
 
@@ -87,7 +82,7 @@ enum Sport: String, Codable, CaseIterable, Identifiable {
 
     /// Currently supported sports
     static var supported: [Sport] {
-        [.mlb, .nba, .nfl, .nhl, .mls, .wnba, .nwsl, .cbb]
+        [.mlb, .nba, .nfl, .nhl, .mls, .wnba, .nwsl]
     }
 }