feat(MMD-012): Add field service schema
- Create field_service schema with 11 tables
- Add 5 enums: checklist_item_type, diagnosis_type, sync_status, checklist_status, worklog_status
- Add tables: service_checklists, checklist_item_templates, checklist_responses, checklist_item_responses, work_logs, activity_catalog, diagnosis_records, root_cause_catalog, field_evidence, offline_queue_items, field_checkins
- Add 4 views: vw_active_work_logs, vw_pending_sync, vw_technician_activity, vw_checklist_summary
- Add triggers for duration calculation and count updates
- Add RLS policies for multi-tenant isolation
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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