feat(freight-api): add DJF as a supported currency

Adds DJF to freight.payments_currency_enum (migration 3860000000000,
alone in its own migration per Postgres's ADD VALUE-in-a-transaction
restriction) and to manual_payment_settings (djf_enabled column,
migration 3870000000000, default true).

Replaces the binary ETB/USD assumptions that would have silently
mispriced or discarded a DJF booking:
- booking-pricing / contract-pricing: usdToEtb scalar -> a rate table
  keyed by source currency (ExchangeService.getRateTable), so a
  contract-frozen rate converts into whatever currency the booking is
  paid in instead of being dropped when neither leg is ETB or USD.
- warehouse-fee / booking-wagon-cancellation: normalizeCurrency no
  longer coerces anything non-ETB to USD.
- additional-charge: convertAmount no longer bails out for a currency
  that isn't literally ETB or USD.
- manual-payment-settings: isEnabled/enabledCurrencies cover DJF.

Widens the three @IsIn(['ETB','USD']) DTO validators, and adds DJF to
the export/report currency filter option lists.

Claude-Session: https://claude.ai/code/session_01CZy77vCWhka3pnmVF9NDkL

apps/edr-freight-api/src/migrations/3860000000000-AddDjfPaymentsCurrency.ts

@@ -0,0 +1,26 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Adds DJF to `freight.payments_currency_enum` — the only currency column in
+ * the schema backed by a real Postgres enum (every other currency column is
+ * a plain varchar and needed no migration).
+ *
+ * This statement must be the ONLY thing in its migration: `ALTER TYPE ... ADD
+ * VALUE` cannot be used within the same transaction that added it (Postgres
+ * restriction, still true on PG 12+), and migrations here run one-per-
+ * transaction (`migrationsTransactionMode: 'each'`). Do not add a seed insert
+ * that writes 'DJF' into `payments.currency` to this file.
+ */
+export class AddDjfPaymentsCurrency3860000000000 implements MigrationInterface {
+  name = 'AddDjfPaymentsCurrency3860000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`ALTER TYPE freight.payments_currency_enum ADD VALUE IF NOT EXISTS 'DJF'`);
+  }
+
+  public async down(): Promise<void> {
+    // Postgres cannot drop a single enum value. Reverting would require
+    // recreating the type and every dependent column/constraint — out of
+    // scope for a currency addition; leave it in place.
+  }
+}

apps/edr-freight-api/src/migrations/3870000000000-AddDjfManualPaymentSetting.ts

@@ -0,0 +1,23 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Adds the DJF toggle to `manual_payment_settings`, alongside the existing
+ * `etb_enabled`/`usd_enabled` columns. Defaults to `true` — like USD, DJF
+ * invoices are bank-transfer-settleable from day one.
+ */
+export class AddDjfManualPaymentSetting3870000000000 implements MigrationInterface {
+  name = 'AddDjfManualPaymentSetting3870000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.manual_payment_settings
+        ADD COLUMN IF NOT EXISTS djf_enabled boolean NOT NULL DEFAULT true;
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.manual_payment_settings DROP COLUMN IF EXISTS djf_enabled;
+    `);
+  }
+}