refactor(backend/api): extract compliance routes services (Step 4 — file 13 of 18)
Split routes.py (991 LOC) into thin handlers + two service files: - RegulationRequirementService: regulations CRUD, requirements CRUD - ControlExportService: controls CRUD/review/domain, export, admin seeding All 216 tests pass. Route module re-exports repository classes so existing test patches (compliance.api.routes.*Repository) keep working. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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