INSDC Project compliance: enforce field constraints and add Collaborator affiliation support

[mgonzalezporta]

Summary

Align the Project entity in webin-xml with the INSDC minimum specifications.

Changes

#	INSDC Field	Requirement	Previous Status	Changes Made
1	Description	Mandatory, 20-4000 chars	Optional (minOccurs="0"), no length check	XSD: changed to minOccurs="1", added minLength=20 / maxLength=4000 restriction
2	Title	Mandatory, 20-250 chars	Mandatory, no length check	XSD: added minLength=20 / maxLength=250 restriction
3	Submitter Name	Mandatory	Present via center_name attribute	No change needed — already handled by ObjectType
4	Project Type	Umbrella or Submission	Present via xs:choice	No change needed — already enforced
5	Contributor Name	Optional	COLLABORATOR was a plain string	XSD: COLLABORATOR is now a complex type with NAME + AFFILIATION children. New Collaborator.java model. collaborators field added to Project.java and XmlProject.java with mapping in both directions.
6	Contributor Affiliation	Optional	Missing entirely	Covered by the same COLLABORATOR restructure above — AFFILIATION is an optional child element
7	Publication	Optional (PubMed/DOI)	Present via PROJECT_LINKS	No change needed — already supported via XREF links

Files changed

• ENA.project.xsd — Description mandatory + length constraints on Title/Description + Collaborator restructure
• Project.java — Added collaborators field + mapping
• XmlProject.java — Added collaborators field with XML annotations + mapping
• Collaborator.java — New model class (name + affiliation)

Not addressed at schema level

These are application-level concerns that cannot be enforced via XSD:

• ASCII-only constraint — requires application-layer validation
• Uniqueness per submitter — database/application constraint
• Hierarchy rules (umbrellas can't have data directly, submission projects can't be parents) — business logic enforcement

Testing

Important: No tests have been run (no access to GitLab token)

[dipayan1985]

@mgonzalezporta @haseeb-gh I would recommend adding a couple of unit tests for this change.

1. Project object serialization and deserialization testing.
2. Webin submission object serialization and deserialization testing.

[dipayan1985]

I would recommend adding unit tests for project serialization and deserialization and webin submission serialization and deserialization.