feat: RegionPreviewValue support (DEV-6300)

[siers]

RegionPreviewValue support (DEV-6300)

New value type: a resource points at a Region via hasRegionPreview. Only the link (isRegionPreviewOf) is stored. The IIIF preview URL is computed at read time, never persisted.

Pipeline

Write: JSON-LD isRegionPreviewOf  →  persist  <value> kb:isRegionPreviewOf <region>
Read:  RegionPreviewValue (iiifUrl = None)  →  fetch region (geometry) + still image (filename)
       →  iiifUrl = …/pct:x,y,w,h/full/0/default.jpg     (fetched resources not returned)

Change summary

• knora-base.ttl & OntologyConstants.scala — RegionPreviewValue / hasRegionPreview / isRegionPreviewOf / iiifUrl; v51 → v52
• ValueMessagesV2.scala — RegionPreviewValueContentV2 (value type, JSON-LD, parser); GeomValueContentV2.parsePoints
• ApiComplexV2JsonLdRequestParser.scala, ResourceCreateModels.scala, ResourcesRepoLive.scala — write path: parse + persist isRegionPreviewOf
• ConstructResponseUtilV2.scala — read path: dispatch RegionPreviewValue; iiifUrl = None (deferred to the service)
• ReadResourcesServiceLive.scala — augmentRegionPreviewValues: region geometry → pct:x,y,w,h, still-image filename → IIIF URL
• ReadResourcesServiceLiveSpec.scala – finally has a standalone test! previously implicitly tested
• GravsearchTypeInspectionUtil.scala, ResourceMessagesV2.scala, Vocabulary.scala — supporting constants/accessors
• acceptance test fixture updates

[linear-code]

DEV-6300 Backend support for Annotation Values

[codecov]

Codecov Report

❌ Patch coverage is 93.12977% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.06%. Comparing base (a978c50) to head (c0ba1f7).

Files with missing lines	Patch %	Lines
...e/resources/service/ReadResourcesServiceLive.scala	96.05%	3 Missing ⚠️
...ice/resources/repo/service/ResourcesRepoLive.scala	0.00%	2 Missing ⚠️
...ervice/value/queries/InsertValueQueryBuilder.scala	50.00%	2 Missing ⚠️
...webapi/messages/util/ConstructResponseUtilV2.scala	88.88%	1 Missing ⚠️
...ponders/v2/resources/CreateResourceV2Handler.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4110      +/-   ##
==========================================
+ Coverage   85.98%   86.06%   +0.07%     
==========================================
  Files         538      538              
  Lines       30571    30586      +15     
  Branches     3559     3554       -5     
==========================================
+ Hits        26286    26323      +37     
+ Misses       4285     4263      -22     

Flag	Coverage Δ
e2e	86.06% <93.12%> (+0.07%)	⬆️
integration	86.06% <93.12%> (+0.07%)	⬆️
unit	86.06% <93.12%> (+0.07%)	⬆️

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[siers]

Ran claude as the reviewer, there are two things