test(backend): add service unit tests and controller slice tests
Service unit tests (Mockito, no Spring context):
- DocumentServiceTest — getById, updateDocument, deleteTagCascading, createPlaceholder
- PersonServiceTest — getById, findOrCreateByAlias, mergePersons
- TagServiceTest — getById, findOrCreate, update, delete
- UserServiceTest — findByUsername, deleteUser, createUserOrUpdate, getGroupById
Controller slice tests (@WebMvcTest):
- DocumentControllerTest — 401/403/200 for GET /search, POST /, PUT /{id}
- TagControllerTest — 401/403/200 for GET, PUT /{id}, DELETE /{id}
Also removes FamilienarchivApplicationTests (full @SpringBootTest
requires DB + S3 infrastructure; covered by e2e job instead).
65 tests total, all passing.
Refs #4
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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