Register CLARIN link repositories under plural model names (DSpace 9 contract)

Six CLARIN LinkRestRepository beans are still registered under the singular model
name, so all six advertised sub-resources return 404 on the v9 base while they
return 200 on 7.6.5.

DSpace 7 singularized the URL segment before the bean lookup --
Utils.getLinkResourceRepository() called makeSingular(modelPlural). DSpace 9
removed that step and looks the bean up under the plural segment verbatim, so a
link repository must now be registered as <category>.<typePlural>.<rel>. The
upstream migration renamed its own 71 link repositories accordingly and added
PLURAL_NAME to the REST models, but these six CLARIN ones were missed.

Note ClarinLicenseResourceUserAllowanceRestRepository (the MAIN repository) *was*
migrated to PLURAL_NAME, which is why GET /core/clarinlruallowances/242 returns
200 while every one of its rels 404s. Migrating a main repository without its
link repositories leaves all its sub-resources dead.

Why this is easy to misread: a missing bean raises RepositoryNotFoundException,
and a missing route resolves BEFORE any authorization check. The one defect
therefore surfaces as "404 != 200" for an admin, "404 != 401" for anonymous and
"404 != 403" for a non-owner -- it reads like an authorization problem, and the
404 body names the plural type that is not how the bean is registered:

  {"status":404,"message":"The repository type core.clarinlruallowances was not found"}

Meanwhile the allowance JSON keeps advertising all three _links, so the API
describes endpoints it cannot serve.

Measured, admin token, dev-6.pc:8603 (9.3) vs dev-5.pc:88 (7.6.5):

  core/clarinlruallowances/242                            200   200
  core/clarinlruallowances/242/userMetadata               *404*  200
  core/clarinlruallowances/242/userRegistration           *404*  200
  core/clarinlruallowances/242/resourceMapping            *404*  200
  core/clarinuserregistrations/1/userMetadata             *404*  200
  core/clarinuserregistrations/1/clarinLicenses           *404*  200
  core/clarinlicenseresourcemappings/1383/clarinLicense   *404*  200

Audit backing the "six and only six" claim: of 77 LinkRestRepository
implementations on this branch, 71 already use PLURAL_NAME, these 6 used NAME,
and none uses a literal bean-name string. Every main (non-link) repository is
already plural. So this closes the gap completely.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: Matus Kasak

dspace-server-webapp/src/main/java/org/dspace/app/rest/repository/CLRUAResourceMappingLinkRepository.java

@@ -28,7 +28,7 @@
 /**
  * CLRUA = ClarinLicenseResourceUserAllowance
  */
-@Component(ClarinLicenseResourceUserAllowanceRest.CATEGORY + "." + ClarinLicenseResourceUserAllowanceRest.NAME +
+@Component(ClarinLicenseResourceUserAllowanceRest.CATEGORY + "." + ClarinLicenseResourceUserAllowanceRest.PLURAL_NAME +
         "." + ClarinLicenseResourceUserAllowanceRest.RESOURCE_MAPPING)
 public class CLRUAResourceMappingLinkRepository extends AbstractDSpaceRestRepository
         implements LinkRestRepository {

dspace-server-webapp/src/main/java/org/dspace/app/rest/repository/CLRUAUUserRegistrationLinkRepository.java

@@ -29,7 +29,7 @@
 /**
  * CLRUA = ClarinLicenseResourceUserAllowance
  */
-@Component(ClarinLicenseResourceUserAllowanceRest.CATEGORY + "." + ClarinLicenseResourceUserAllowanceRest.NAME +
+@Component(ClarinLicenseResourceUserAllowanceRest.CATEGORY + "." + ClarinLicenseResourceUserAllowanceRest.PLURAL_NAME +
         "." + ClarinLicenseResourceUserAllowanceRest.USER_REGISTRATION)
 public class CLRUAUUserRegistrationLinkRepository extends AbstractDSpaceRestRepository
         implements LinkRestRepository {

dspace-server-webapp/src/main/java/org/dspace/app/rest/repository/CLRUAUserMetadataLinkRepository.java

@@ -32,7 +32,7 @@
 /**
  * CLRUA = ClarinLicenseResourceUserAllowance
  */
-@Component(ClarinLicenseResourceUserAllowanceRest.CATEGORY + "." + ClarinLicenseResourceUserAllowanceRest.NAME +
+@Component(ClarinLicenseResourceUserAllowanceRest.CATEGORY + "." + ClarinLicenseResourceUserAllowanceRest.PLURAL_NAME +
         "." + ClarinLicenseResourceUserAllowanceRest.USER_METADATA)
 public class CLRUAUserMetadataLinkRepository extends AbstractDSpaceRestRepository
         implements LinkRestRepository {

dspace-server-webapp/src/main/java/org/dspace/app/rest/repository/CUserRegistrationCLicenseLinkRepository.java

@@ -27,7 +27,7 @@
 import org.springframework.data.rest.webmvc.ResourceNotFoundException;
 import org.springframework.stereotype.Component;
 
-@Component(ClarinUserRegistrationRest.CATEGORY + "." + ClarinUserRegistrationRest.NAME + "." +
+@Component(ClarinUserRegistrationRest.CATEGORY + "." + ClarinUserRegistrationRest.PLURAL_NAME + "." +
         ClarinUserRegistrationRest.CLARIN_LICENSES)
 public class CUserRegistrationCLicenseLinkRepository extends AbstractDSpaceRestRepository
         implements LinkRestRepository {

dspace-server-webapp/src/main/java/org/dspace/app/rest/repository/ClarinResourceMappingCLicenseLinkRepository.java

@@ -24,7 +24,7 @@
 import org.springframework.data.rest.webmvc.ResourceNotFoundException;
 import org.springframework.stereotype.Component;
 
-@Component(ClarinLicenseResourceMappingRest.CATEGORY + "." + ClarinLicenseResourceMappingRest.NAME +
+@Component(ClarinLicenseResourceMappingRest.CATEGORY + "." + ClarinLicenseResourceMappingRest.PLURAL_NAME +
         "." + ClarinLicenseResourceMappingRest.CLARIN_LICENSE)
 public class ClarinResourceMappingCLicenseLinkRepository extends AbstractDSpaceRestRepository
         implements LinkRestRepository {

dspace-server-webapp/src/main/java/org/dspace/app/rest/repository/ClarinUserRegistrationUserMetadataLinkRepository.java

@@ -25,7 +25,7 @@
 import org.springframework.data.rest.webmvc.ResourceNotFoundException;
 import org.springframework.stereotype.Component;
 
-@Component(ClarinUserRegistrationRest.CATEGORY + "." + ClarinUserRegistrationRest.NAME + "." +
+@Component(ClarinUserRegistrationRest.CATEGORY + "." + ClarinUserRegistrationRest.PLURAL_NAME + "." +
         ClarinUserRegistrationRest.USER_METADATA)
 public class ClarinUserRegistrationUserMetadataLinkRepository extends AbstractDSpaceRestRepository
         implements LinkRestRepository {