feat: implement routes-b referrals/earnings, products delete, routed deposits addresses delete, feature-flags

[gelluisaac]

Implemented endpoints

1. GET /api/routes-b/referrals/earnings — app/api/routes-b/referrals/earnings/route.ts

   • Fetches ReferralEarning rows for the authenticated referrer.
   • Supports optional status, limit (capped at 100), and offset query params.
   • Returns structured JSON with earnings array and pagination.

2. DELETE /api/routes-b/products/[id] — app/api/routes-b/products/[id]/route.ts

   • Soft-deletes a product by setting isActive = false.
   • Validates ownership via where: { id, userId: user.id }.
   • Returns 204 No Content on success.

3. DELETE /api/routes-d/deposits/addresses/[id] — app/api/routes-d/deposits/addresses/[id]/route.ts

   • Archives a deposit address by setting status = "archived".
   • Enforces ownership and returns 403 Forbidden when the address belongs to another user.

4. GET /api/routes-d/feature-flags — app/api/routes-d/feature-flags/route.ts

   • Returns the current feature flags for the authenticated user.
   • Auth-required; structured envelope matches other routes.

Test results

All 24 new tests pass:

• app/api/routes-b/referrals/earnings/__tests__/referrals-earnings.test.ts — 7/7
• app/api/routes-b/products/[id]/__tests__/delete-product.test.ts — 7/7
• app/api/routes-d/deposits/addresses/[id]/__tests__/delete-deposit-address.test.ts — 7/7
• app/api/routes-d/feature-flags/__tests__/feature-flags.test.ts — 3/3
  closes [routes-b] GET /api/routes-b/referrals/earnings - fetch referral earnings #1016
  closes [routes-b] DELETE /api/routes-b/products/[id] - delete a product #1002
  closes [routes-d] DELETE /api/routes-d/deposits/addresses/[id] - remove a deposit address #1029
  closes [routes-d] GET /api/routes-d/feature-flags - list feature flags #996

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