HDPI-3766: Universal Credit and Priority Debt details (BE)

[andrewdami11]

Jira link

See HDPI-3766

FRONTEND PR

Change description

This PR is the pcs-api (backend) piece for HDPI-3766 (defendant respond-to-claim: Universal Credit, priority debts, priority debt details, and related income/expense capture). It extends the CCD domain model and persistence mapping for household circumstances so mid-event / draft data from the frontend can be stored and read for those screens.

Testing done

• Unit tests: HouseholdCircumstancesServiceTest updated/extended.

Security Vulnerability Assessment

CVE Suppression: Are there any CVEs present in the codebase (either newly introduced or pre-existing) that are being intentionally suppressed or ignored by this commit?

• Yes
• No

Checklist

• commit messages are meaningful and follow good commit message guidelines
• README and other documentation has been updated / added (if needed)
• tests have been updated / new tests has been added (if needed)
• Does this PR introduce a breaking change

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[github-actions]

CCD diff summary

👉 Full report: https://github.com/hmcts/pcs-api/actions/runs/23910834633?check_suite_focus=true

ComplexTypes/1_HouseholdCircumstances.json

ListElementCode	ID	FieldType	ElementLabel
+shareIncomeExpenseDetails	+HouseholdCircumstances	+YesOrNo	+
+regularIncome	+HouseholdCircumstances	+Text	+
+universalCredit	+HouseholdCircumstances	+YesOrNo	+
+ucApplicationDate	+HouseholdCircumstances	+Date	+
+priorityDebts	+HouseholdCircumstances	+YesOrNo	+
+debtTotal	+HouseholdCircumstances	+MoneyGBP	+
+debtContribution	+HouseholdCircumstances	+MoneyGBP	+
+debtContributionFrequency	+HouseholdCircumstances	+Text	+
+regularExpenses	+HouseholdCircumstances	+Text	+
+expenseAmount	+HouseholdCircumstances	+MoneyGBP	+
+expenseFrequency	+HouseholdCircumstances	+Text	+