feat(planning): add trip filtering and fix departure date logic

- Add Trip.status property for status tracking
- Add RouteFilters trip list methods (filterBySport, filterByDateRange, filterByStatus, applyFilters)
- Add TravelEstimator max driving hours validation
- Fix ScenarioA/B departureDate to use last game day (not day after)
- Update GameDAGRouter comments for buffer logic

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

SportsTime/Core/Models/Domain/Trip.swift

@@ -17,6 +17,7 @@ struct Trip: Identifiable, Codable, Hashable {
     var totalDistanceMeters: Double
     var totalDrivingSeconds: Double
     var score: TripScore?
+    var status: TripStatus
 
     init(
         id: UUID = UUID(),
@@ -29,7 +30,8 @@ struct Trip: Identifiable, Codable, Hashable {
         totalGames: Int = 0,
         totalDistanceMeters: Double = 0,
         totalDrivingSeconds: Double = 0,
-        score: TripScore? = nil
+        score: TripScore? = nil,
+        status: TripStatus = .planned
     ) {
         self.id = id
         self.name = name
@@ -42,6 +44,7 @@ struct Trip: Identifiable, Codable, Hashable {
         self.totalDistanceMeters = totalDistanceMeters
         self.totalDrivingSeconds = totalDrivingSeconds
         self.score = score
+        self.status = status
     }
 
     var totalDistanceMiles: Double { totalDistanceMeters * 0.000621371 }