chore: add OSRM-related type definitions for GPS routes

Adds distanceMethod to DriverStatsDto and LocationHistoryResponse interface
to support the OSRM road-snapping feature.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/gps/dto/location-response.dto.ts

@@ -33,6 +33,7 @@ export class DriverStatsDto {
     averageSpeedMph: number;
     totalTrips: number;
     totalDrivingMinutes: number;
+    distanceMethod?: string; // 'osrm' or 'haversine'
   };
   recentLocations: LocationDataDto[];
 }

frontend/src/types/gps.ts

@@ -106,3 +106,12 @@ export interface MyGpsStatus {
   lastActive?: string;
   message?: string;
 }
+
+export interface LocationHistoryResponse {
+  matched: boolean;
+  coordinates?: [number, number][]; // road-snapped [lat, lng] pairs
+  distance?: number; // road distance in meters
+  duration?: number; // duration in seconds
+  confidence?: number; // 0-1 confidence score
+  rawPositions?: Array<{ latitude: number; longitude: number; speed: number; timestamp: Date }>;
+}