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Deelzaak Support (Sub-case Hierarchy)

Issue: #83 Branch: feature/83/deelzaak-support

Overview​

Adds hierarchical case support (deelzaken) enabling a parent case to spawn child cases for parallel departmental processing. For example, an Omgevingsvergunning parent case can spawn separate sub-cases for building assessment, environmental impact, and fire safety: each with their own lifecycle, assignees, and deadlines.

Capabilities​

  • Create sub-case from parent case detail view with case type constraint enforcement (subCaseTypes list)
  • Sub-cases section on parent case detail showing title, status, assignee, and deadline
  • Sub-case progress roll-up indicator ("X/Y completed") in section header
  • Parent case breadcrumb navigation on sub-case detail views
  • Sub-case count badge in case list for parent cases
  • Nesting prevention: sub-cases cannot spawn further sub-cases (single level only)
  • Deletion protection: warns about sub-case detachment, clears parentCase on children before deleting parent
  • Case store extended to support filtering by parentCase and loading sub-case trees

ZGW Mapping​

Maps bidirectionally to ZGW hoofdzaak / deelzaken fields in the Zaken API (ZRC-013 compliant).

Validation​

  • Sub-case cannot be created if the parent case is closed
  • Sub-case type must be in the parent case type's subCaseTypes list
  • Maximum nesting depth: 1 level (sub-cases cannot have sub-cases)