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/contracts/contract-pricing.service.ts

@@ -177,8 +177,14 @@ export class ContractPricingService {
       }
     }
     if (contract.lastMileDeliveryAddress) {
+      // New-style last-mile rates (PER_TON_KM / distance-banded PER_KM) are
+      // priced operationally per job, not as a single contract unit price.
       const lm = liveRates.find(
-        (r) => r.rateType === 'LAST_MILE' && r.currency === 'USD',
+        (r) =>
+          r.rateType === 'LAST_MILE' &&
+          r.currency === 'USD' &&
+          r.rateUnit !== 'PER_TON_KM' &&
+          r.minKm == null,
       );
       if (lm && Number(lm.rateValue) > 0) {
         lineItems.push({