Add Civora/Piveau integration: DCAT-AP.de compliance

[daimpad]

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Summary

Implements all changes required for automated harvesting by Civora (Piveau-based) via the existing /wp-json/datenatlas/v1/catalog endpoint.

Critical fixes (blocked correct ingestion)

• dcat:theme: Values now stored/output as EU data-theme vocabulary URIs (e.g. ENVI, EDUC, HEAL) instead of plain German text labels. Dropdown expanded from 8 to 14 EU-standard categories. Legacy text values auto-migrated in JSON-LD builder.
• dct:format (distributions): Now outputs EU file-type URIs (http://publications.europa.eu/resource/authority/file-type/CSV) instead of MIME types. New get_format_eu_uri() method; get_format_mime() preserved for backward compat.
• dct:language: Now outputs EU language URIs (DEU, ENG) as @id references. Legacy de/en codes auto-migrated both in JSON-LD builder and Settings sanitize.
• dct:license: Now rendered as {"@id": "..."} reference at both dataset and distribution level (previously only dataset-level plain string).

New recommended fields (DCAT-AP.de)

• dcatde:politicalGeocodingLevelURI: New select field in Tab 4 with dcatde vocabulary URIs (Bund / Land / Landkreis / Gemeinde).
• dcatde:licenseAttributionByText: New text field per distribution for naming attribution required by CC BY / CC BY-SA licenses.
• dct:description (catalog level): New textarea in Settings → Katalog, exposed via odw_catalog_description filter in /catalog endpoint.

Technical

• dcatde namespace added to JSON-LD @context
• New helper methods: get_format_eu_uri(), get_language_options(), get_political_geocoding_level_options()
• Settings: language defaults use EU URIs; legacy codes migrated on next save
• 19 new PHPUnit tests covering all new behaviors (88 total, all passing)
• 0 PHPCS violations

Test plan

• PHPCS: ./vendor/bin/phpcs --standard=./config/phpcs.xml includes/ → 0 violations
• PHPUnit: ./vendor/bin/phpunit --configuration config/phpunit.xml → 88 tests pass
• Manually create a dataset, check JSON-LD preview tab: dcat:theme, dct:language, dct:format show URIs not plain strings
• Check /wp-json/datenatlas/v1/catalog response: @context contains dcatde, distributions carry dct:license
• Fill Katalog-Beschreibung in Settings → verify it appears as dct:description in /catalog
• Fill Verwaltungsebene + Namensnennungstext in Tab 4 / Distribution → verify JSON-LD output

https://claude.ai/code/session_019GKkt3ATWaQtsSCCTExXsD
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