Surface a DataSet's own licence in term info

[Robbie1977]

Problem

Every DataSet page in v2 renders without a License row, e.g.
https://v2.virtualflybrain.org/org.geppetto.frontend/geppetto?id=Berg2025

The licence is in the KB — (:DataSet {short_form:'Berg2025'})-[:has_license]->(:License {short_form:'VFBlicense_CC_BY_4_0'}) — and it shows correctly in the AllDatasets results table. It is lost in term-info serialisation.

Cause

QueryLibrary.dataset_term_info (VFB_json_schema) uses the license() clause, so a dataset's licence comes back in license. Images and templates use dataSet_license() and come back in dataset_license.

term_info_parse_object only ever read dataset_license, so DataSet terms serialised as "Licenses": {}. Downstream, VFBProcessTermInfoVFBqueryJson.licenseList() builds the Source + License block from Licenses{} alone, so with an empty dict no License row is added.

The fallback exists everywhere else — term_info_queries.VFBTerm.get_license() has elif self.license:, and the legacy VFBProcessTermInfoJson.getLicense() has the same else if. Only this serialiser lost it, so the row disappeared when v2 moved onto the VFBquery term-info path.

Fix

Add the missing branch. source/source_iri are left empty: the dataset is its own source, and an empty source stops the panel rendering a Source row that links back to the page you are already on. No Java or client change needed — the License slot is already in VFBMain.js's ordered field list.

Verification

Parsed against live SOLR after the change:

Dataset	Licence
Berg2025	CC-BY 4.0
Bates2025	CC-BY 4.0
Dorkenwald2023	CC-BY-NC 4.0
Cachero2010	CC-BY-SA 4.0

Three tests added to test_term_info_parity.py as Gap E, alongside the gaps this serialiser has already been reconciled against. The two dataset tests fail on main and pass here; the third asserts the dataset_license path is unchanged (JRC2018U keeps both its licence and its source attribution).

Note: test_individual_synonyms_present in that file already fails on main and is untouched by this change.

[Clare72]

The elif means a term carrying both dataset_license and its own license would only surface the inherited one. In practice the query library populates one or the other per term type, and this matches get_license(), so it's fine — worth a one-line acknowledgement, not a change.

[Robbie1977]

Agreed — deliberate, and it matches get_license(): if both were ever populated, dataset_license wins. In practice the query library gives you one or the other (dataset_term_info → license, anatomical_ind/template/pub_term_info → dataset_license), so the case doesn't arise today. Noted at the branch point in 541cc12 rather than changing the behaviour.