feat(cowork-service): H.12 marketplace proxy — migrate TO platform marketplace
Add marketplace module that proxies all requests to platform-service's
marketplace module. Replaces the local plugin marketplace (Phase 10)
with the shared ByteLyst platform marketplace.
Endpoints proxied (18 routes):
Public: browse catalog, listing detail, reviews, featured, categories
Consumer: install/uninstall, my installs, add review, vote toggle
Author: create/update/delete listings, my listings, submit, publish
Changes:
- modules/marketplace/types.ts: Zod schemas for query validation
- modules/marketplace/routes.ts: 18 proxy routes with proxyGet/proxyMutate
helpers, productId injection, x-request-id forwarding
- modules/marketplace/routes.test.ts: 13 tests (public, consumer, author,
error handling, 502 fallback, query validation)
- server.ts: Register marketplaceRoutes (8th module), fix costUsd type cast
- server.test.ts: Add marketplace mock, update register count 7→8
Test count: 98 (was 85)
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