feat: add GPS tracking with Traccar integration

- Add GPS module with Traccar client service for device management
- Add driver enrollment flow with QR code generation
- Add real-time location tracking on driver profiles
- Add GPS settings configuration in admin tools
- Add Auth0 OpenID Connect setup script for Traccar
- Add deployment configs for production server
- Update nginx configs for SSL on GPS port 5055
- Add timezone setting support
- Various UI improvements and bug fixes

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

backend/prisma/schema.prisma

@@ -115,6 +115,7 @@ model Driver {
   events          ScheduleEvent[]
   assignedVehicle Vehicle?        @relation("AssignedDriver")
   messages        SignalMessage[] // Signal chat messages
+  gpsDevice       GpsDevice?      // GPS tracking device
 
   createdAt       DateTime        @default(now())
   updatedAt       DateTime        @updatedAt
@@ -281,6 +282,9 @@ model PdfSettings {
   showAppUrl                 Boolean  @default(false)
   pageSize                   PageSize @default(LETTER)
 
+  // Timezone for correspondence and display (IANA timezone format)
+  timezone                   String   @default("America/New_York")
+
   // Content Toggles
   showFlightInfo        Boolean @default(true)
   showDriverNames       Boolean @default(true)
@@ -303,3 +307,81 @@ enum PageSize {
   A4
 }
 
+// ============================================
+// GPS Tracking
+// ============================================
+
+model GpsDevice {
+  id                String    @id @default(uuid())
+  driverId          String    @unique
+  driver            Driver    @relation(fields: [driverId], references: [id], onDelete: Cascade)
+
+  // Traccar device information
+  traccarDeviceId   Int       @unique // Traccar's internal device ID
+  deviceIdentifier  String    @unique // Unique ID for Traccar Client app
+
+  // Privacy & Consent
+  enrolledAt        DateTime  @default(now())
+  consentGiven      Boolean   @default(false)
+  consentGivenAt    DateTime?
+  lastActive        DateTime? // Last location report timestamp
+
+  // Settings
+  isActive          Boolean   @default(true)
+
+  // Location history
+  locationHistory   GpsLocationHistory[]
+
+  createdAt         DateTime  @default(now())
+  updatedAt         DateTime  @updatedAt
+
+  @@map("gps_devices")
+}
+
+model GpsLocationHistory {
+  id              String    @id @default(uuid())
+  deviceId        String
+  device          GpsDevice @relation(fields: [deviceId], references: [id], onDelete: Cascade)
+
+  latitude        Float
+  longitude       Float
+  altitude        Float?
+  speed           Float?    // km/h
+  course          Float?    // Bearing in degrees
+  accuracy        Float?    // Meters
+  battery         Float?    // Battery percentage (0-100)
+
+  timestamp       DateTime
+
+  createdAt       DateTime  @default(now())
+
+  @@map("gps_location_history")
+  @@index([deviceId, timestamp])
+  @@index([timestamp]) // For cleanup job
+}
+
+model GpsSettings {
+  id                    String   @id @default(uuid())
+
+  // Update frequency (seconds)
+  updateIntervalSeconds Int      @default(60)
+
+  // Shift-based tracking (4AM - 1AM next day)
+  shiftStartHour        Int      @default(4)  // 4 AM
+  shiftStartMinute      Int      @default(0)
+  shiftEndHour          Int      @default(1)  // 1 AM next day
+  shiftEndMinute        Int      @default(0)
+
+  // Data retention (days)
+  retentionDays         Int      @default(30)
+
+  // Traccar credentials
+  traccarAdminUser      String   @default("admin")
+  traccarAdminPassword  String?  // Encrypted or hashed
+
+  createdAt             DateTime @default(now())
+  updatedAt             DateTime @updatedAt
+
+  @@map("gps_settings")
+}
+