test(ssr): expose seeded client ids in /test-info (Phase 8 gate scaffolding)

The New Invoice wizard's basic-details step needs a client + vendor in its Solr
typeaheads; tests inject the seeded ids. accounts.vendor was already exposed; add
:clientIds (TEST / TEST2) so the upcoming Phase 8 parity gate can drive the create flow.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/clj/auto_ap/test_server.clj

@@ -225,6 +225,7 @@
    :body (cheshire.core/generate-string
           {:transactionId @test-transaction-id
            :accounts @test-account-ids
+           :clientIds @test-client-ids
            :clientMode @test-identity-mode
            :salesSummaryId @test-sales-summary-id
            :ruleId @test-rule-id