Audit Suite API — backend for Screens 3-13

GET  /api/health
GET  /api/dashboard/stats
GET  /api/dashboard/recent
GET  /api/dashboard/activity                       (?limit=N — cross-engagement activity feed)
GET  /api/dashboard/in-progress                    (?limit=N — top active engagements + their next doc)

GET  /api/clients                       (?filter=returning|new|active)
POST /api/clients
GET  /api/clients/:id
PUT  /api/clients/:id
DEL  /api/clients/:id

GET  /api/templates                                 (?include=archived | ?only=archived)
GET  /api/templates/:idOrCode
POST /api/templates                                 (body: { title, category, code?, description?, est_minutes?, schema? })
PUT  /api/templates/:id                             (body: { title?, description?, category?, code?, ordinal?, est_minutes? })
PUT  /api/templates/:id/schema                      (body: { sections: [...] } or { schema: { sections: [...] } })
DEL  /api/templates/:id                             (soft-delete via archived_at)
POST /api/templates/:id/restore

GET  /api/engagements                   (?status=active|completed|overdue&q=)
POST /api/engagements                   (body: client_id, financial_year, [template_ids], [clone_from_engagement_id])
GET  /api/engagements/:id
PUT  /api/engagements/:id
DEL  /api/engagements/:id
POST /api/engagements/:id/documents     (body: { template_ids: [...] })
DEL  /api/engagements/:id/documents/:docId
GET  /api/engagements/:id/activity

GET  /api/documents/:edocId
PUT  /api/documents/:edocId             (body: { response: {...}, status?, ... })
POST /api/documents/:edocId/submit      (body: { signed_by, signature_date })
GET  /api/documents/:edocId/pdf-payload

GET  /api/documents/:edocId/remarks                (?kind=official|internal&target_kind=...&target_id=...)
POST /api/documents/:edocId/remarks                (body: { kind, target_kind, target_id, parent_id?, body })
PUT  /api/documents/:edocId/remarks/:remarkId      (body: { body })
DEL  /api/documents/:edocId/remarks/:remarkId
POST /api/documents/:edocId/remarks/:remarkId/like

GET  /api/documents/:edocId/checklist
PUT  /api/documents/:edocId/checklist/:itemId      (body: { checked: bool })

GET  /api/history                                  (?client_id=X&from=YYYY-MM-DD&to=YYYY-MM-DD)
GET  /api/history/clients                          (clients that have completed engagements)

GET  /api/settings                                 (app-wide settings, deep-merged with defaults)
PUT  /api/settings                                 (body: partial patch, deep-merged with current)

Static: /screens/SCREEN%203.html, /screens/SCREEN%204A.html ... /screens/SCREEN%2013.html