feat: complete maintenance tracking backend

Service/Controller/Module:
- scheduleMaintenanceAsync: schedule work
- recordMaintenanceCost: log expenses
- getUpcomingMaintenance: due items
- getVehicleMaintenanceStats: cost aggregation

Endpoints:
- POST /maintenance/schedules
- POST /maintenance/costs
- PATCH /maintenance/schedules/:id
- GET /maintenance/upcoming/:vehicleId
- GET /maintenance/history/:vehicleId
- GET /maintenance/stats/:vehicleId

Migration: idempotent maintenance tables creation

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

apps/edr-freight-api/src/modules/maintenance/maintenance.controller.ts

@@ -0,0 +1,46 @@
+import { Controller, Post, Get, Patch, Body, Param } from '@nestjs/common';
+import { ApiTags, ApiOperation } from '@nestjs/swagger';
+import { MaintenanceService } from './maintenance.service';
+import { CreateMaintenanceScheduleDto, CreateMaintenanceCostDto, UpdateMaintenanceScheduleDto } from './dto/create-maintenance.dto';
+
+@ApiTags('Maintenance Management')
+@Controller('maintenance')
+export class MaintenanceController {
+  constructor(private readonly maintenanceService: MaintenanceService) {}
+
+  @Post('schedules')
+  @ApiOperation({ summary: 'Schedule maintenance' })
+  async scheduleMaintenanceAsync(@Body() dto: CreateMaintenanceScheduleDto) {
+    return this.maintenanceService.scheduleMaintenanceAsync(dto);
+  }
+
+  @Post('costs')
+  @ApiOperation({ summary: 'Record maintenance cost' })
+  async recordCost(@Body() dto: CreateMaintenanceCostDto) {
+    return this.maintenanceService.recordMaintenanceCost(dto);
+  }
+
+  @Patch('schedules/:id')
+  @ApiOperation({ summary: 'Update maintenance schedule' })
+  async updateSchedule(@Param('id') id: string, @Body() dto: UpdateMaintenanceScheduleDto) {
+    return this.maintenanceService.updateMaintenanceSchedule(id, dto);
+  }
+
+  @Get('upcoming/:vehicleId')
+  @ApiOperation({ summary: 'Get upcoming maintenance' })
+  async getUpcoming(@Param('vehicleId') vehicleId: string) {
+    return this.maintenanceService.getUpcomingMaintenance(vehicleId);
+  }
+
+  @Get('history/:vehicleId')
+  @ApiOperation({ summary: 'Get maintenance history' })
+  async getHistory(@Param('vehicleId') vehicleId: string) {
+    return this.maintenanceService.getMaintenanceHistory(vehicleId);
+  }
+
+  @Get('stats/:vehicleId')
+  @ApiOperation({ summary: 'Get maintenance statistics' })
+  async getStats(@Param('vehicleId') vehicleId: string) {
+    return this.maintenanceService.getVehicleMaintenanceStats(vehicleId);
+  }
+}