improvement: some files replaced, lots of them i shall say. AGENT.MD file created. some rules and skills added for cursor agent.

.cursor/skills/add-feature/SKILL.md

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+---
+name: dyolink-add-feature
+description: Adds a new Dyolink feature end-to-end (permission, backend module, frontend tab, i18n). Use when the user asks for a new tab, module, screen, or CRUD feature in Dyolink.
+---
+
+# Add a Dyolink feature
+
+Follow this checklist. Adapt steps if the feature is read-only or org-type-specific.
+
+## Checklist
+
+```
+- [ ] 1. Permissions & org type
+- [ ] 2. Backend module
+- [ ] 3. Frontend UI + thin page
+- [ ] 4. i18n (en, fa, nl)
+- [ ] 5. Verify build / tsc
+```
+
+## 1. Permissions & org type
+
+- Add `TAB_{FEATURE}_READ` and `TAB_{FEATURE}_EDIT` to:
+  - `backend/src/common/permissions.ts` (`ALL_TAB_PERMISSIONS`, `EDIT_TO_READ`)
+  - `backend/prisma/seed.ts` (owner defaults per org type)
+  - `backend/src/modules/auth/auth.service.ts` if listed there
+- Frontend: `components/staff/staff-permission-form.ts`, `components/shared/permissions.ts` route prefix if needed.
+- Sidebar: `components/ui/shared/Sidebar.tsx` with `orgTypes` filter.
+
+## 2. Backend module
+
+```
+backend/src/modules/{feature}/
+  {feature}.module.ts
+  {feature}.controller.ts
+  {feature}.service.ts
+  dto/
+```
+
+- Apply guards (`JwtAuthGuard`, org-type guard as needed).
+- Service-level permission checks with `hasEffectivePermission`.
+- DTOs use `ErrorCode` validation messages.
+- Register in `app.module.ts`.
+
+## 3. Frontend
+
+- API client: `frontend/src/lib/api/{feature}.ts`
+- Types: `frontend/src/types/{feature}.ts`
+- UI: `frontend/src/components/ui/{feature}/`
+- Non-UI helpers: `frontend/src/components/{feature}/`
+- Page: thin `app/[locale]/(dashboard)/{feature}/page.tsx` → `{Feature}Page.tsx`
+
+## 4. i18n
+
+Add keys to `en.json`, `fa.json`, `nl.json` under a feature namespace (e.g. `"patients": { ... }`).
+
+## 5. Verify
+
+```bash
+cd backend && npm run build
+cd frontend && npx tsc --noEmit
+```
+
+## Reference implementations
+
+| Pattern | Look at |
+|---------|---------|
+| Thin page + workspace | `treatment/page.tsx`, `TreatmentWorkspace.tsx` |
+| CRUD + permissions | `modules/patients/` |
+| Lab feature | `modules/cases/`, `ui/lab/` |