fix(security): preserve tenant scope through service lookup

[seonghobae]

Objective

Advance tenant-safe job reads after #361 by carrying authenticated tenant authority through the application-service lookup boundary. The service must not globally retrieve a job and filter ownership afterward when the repository exposes a storage-scoped tenant/id query.

Test-first state

This Draft starts intentionally RED at exact test-only head aff4f013f60ea400818693f30d51ff92c227f344. TenantScopedConversionServiceLookupTest requires the service-interface default to fail closed without invoking global getJob(UUID), and requires DefaultDocumentConversionService to delegate directly to ConversionJobRepository.findByTenantAndId(...) while rejecting absent tenant/job authority. Production does not expose getJob(UUID, TenantContext) at this head, so test compilation is expected to fail at that exact boundary.

Stack and scope

Base is #361 branch fix/tenant-id-query-boundary-after-342-20260811 exact head 977492622bc1f26d09c3f5ebbb76461407063f8f, itself stacked on #342. This child adds only the application-service scoped lookup contract/implementation and focused tests. It does not modify controllers, admin deletion, artifact delivery, OIDC/credential work, durable persistence, or canonical docs.

Acceptance

Observe exact-head RED -> smallest service contract/implementation -> exact-head Maven/coverage/Javadoc and emitted CI evidence. Keep Draft while #361/#342 remain open; after ancestors integrate, reconcile this unique delta onto the live protected base and regenerate base-sensitive checks/reviews. Independent write-authorized approval remains a separate protected-merge gate.

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