update

[lynaDev2]

Summary
Adds integration test coverage for three previously untested endpoints, preventing silent regressions on core document anchoring flows.

Changes

• `contract/tests/submit_tests.rs` — 6 tests for `POST /submit` (CT-16)
• `contract/tests/revoke_tests.rs` — 6 tests for `POST /revoke` (CT-17)
• `contract/tests/transfer_tests.rs` — 7 tests for `POST /transfer` (CT-18)

Test Coverage

Each test file covers:

• Valid request returns 200 with expected response shape
• Invalid hash format returns 400 with descriptive error
• Empty/missing required fields return 400
• Duplicate/conflict scenarios return 409
• Stellar client failure returns 500

Stack

• `axum-test` for HTTP layer testing
• `httpmock` for mocking external dependencies
• `InMemoryCache` for isolated, stateless test state

Closes #548
Closes #549
Closes #550

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