feat(rates): last-mile rate rules with bulk per-ton-km and container distance bands

- rates: min_km/max_km columns, PER_TON_KM unit, ETB|USD currency for last mile
- extend UQ_rates_pattern with band start; overlap + shape validation
- shared last-mile charge resolver; approve-dialog price estimate endpoint
- delivery-fee invoice prices via rules, falls back to vehicle price/km
- backoffice: last-mile rate form (mode, container type, band, currency)

apps/edr-freight-api/src/modules/last-mile-requests/last-mile-requests.controller.ts

@@ -42,6 +42,16 @@ export class LastMileRequestsController {
     return this.requestsService.freeTruckCount().then((count) => ({ count }));
   }
 
+  @Get(':id/price-estimate')
+  @BookingStaff(FREIGHT_PERMS.lastMile.requestView)
+  @ApiOperation({
+    summary:
+      'Rule-based last-mile price estimate (estimated km × live last-mile rates) — informational context for approval',
+  })
+  priceEstimate(@Param('id', ParseUUIDPipe) id: string) {
+    return this.requestsService.priceEstimate(id);
+  }
+
   @Get(':id')
   @BookingStaff(FREIGHT_PERMS.lastMile.requestView)
   @ApiOperation({ summary: 'Get a last-mile confirmation request by ID' })