feat(bookings): filter and export booking content

The booking-requests list could filter by freight type but not by what is
actually in the booking, and the export's only cargo column showed the
commodity name — blank for every container booking, which stores no
commodity at all.

Adds one resolver, `bookingContentSql`, that answers "what did the customer
say is in this booking" per freight type: the container lines they entered
("2 × 40FT, 1 × 20FT") for container freight, since the wizard asks them for
no description; the commodity they picked from the cargo tree for bulk,
falling back to their free-text description.

List filters:
- "Content" — a single select flattening the cargo tree the same way the
  booking wizard presents it (group, then each commodity as "Bulk → Wheat").
  Picking a GROUP matches its whole subtree via a recursive walk, so "Bulk"
  returns all 44 bulk bookings rather than the 0 that carry the group id
  itself. This makes the existing, previously unexposed `cargoTypeId` param
  group-aware.
- "Content contains" — a contains-search over the description, the commodity
  name and the container types, so container bookings are reachable by "40FT"
  even though they carry no words of the customer's own.

Both apply through `applyListFilters`, so the list, its summary tiles and its
facets agree, and both are declared on the bookings export dataset — the
export button already forwards the page's filters verbatim.

Export fields: "Content" (default), plus "Cargo description" as its own
column. The old `cargo` column is unchanged and still selectable, relabelled
"Cargo (commodity)"; it loses only its default tick, so saved presets that
name it keep working.

apps/edr-freight-web/backoffice/src/services/bookings.service.ts

@@ -73,6 +73,10 @@ export interface BookingListFilter {
   freightType?: string;
   /** Service type (rule-engine service_types.id). */
   serviceTypeId?: string;
+  /** Cargo type OR cargo group — a group matches every commodity beneath it. */
+  cargoTypeId?: string;
+  /** Contains-search over content: cargo description, commodity, container types. */
+  cargoText?: string;
   /** ONE_TIME | GENERAL_CONTRACT — the booking-kind tab filter. */
   bookingType?: string;
   /** 'true' → customs bookings, 'false' → self-clearance (non-customs). */
@@ -199,6 +203,8 @@ export const bookingsService = {
       if (filter.companyId) params.companyId = filter.companyId;
       if (filter.freightType) params.freightType = filter.freightType;
       if (filter.serviceTypeId) params.serviceTypeId = filter.serviceTypeId;
+      if (filter.cargoTypeId) params.cargoTypeId = filter.cargoTypeId;
+      if (filter.cargoText) params.cargoText = filter.cargoText;
       if (filter.bookingType) params.bookingType = filter.bookingType;
       if (filter.tradeDirection) params.tradeDirection = filter.tradeDirection;
       if (filter.paymentCurrency)
@@ -238,6 +244,8 @@ export const bookingsService = {
       if (filter.contractId) params.contractId = filter.contractId;
       if (filter.freightType) params.freightType = filter.freightType;
       if (filter.serviceTypeId) params.serviceTypeId = filter.serviceTypeId;
+      if (filter.cargoTypeId) params.cargoTypeId = filter.cargoTypeId;
+      if (filter.cargoText) params.cargoText = filter.cargoText;
       if (filter.bookingType) params.bookingType = filter.bookingType;
       if (filter.tradeDirection) params.tradeDirection = filter.tradeDirection;
       if (filter.paymentCurrency)