Add dental module phase 4 and phase 5 documentation, including treatment estimates, clinical operations, and preset content

- Introduced phase 4 documentation detailing treatment estimates, data models, state machines, API endpoints, and new dashboard metrics.
- Added phase 5 documentation covering consumables, lab operations, periodontal charts, sterilization cycles, clinical images, and a checklist for professional review.
- Created a preset content document outlining default dental service packages and protocols for clinics.

CONTEXT.md

@@ -8,9 +8,9 @@ ClinicPro product. This glossary records the language the backend uses for its o
 ### Clinic configuration
 
 **Practice Domain**:
-The single field of practice a clinic declares it operates in — beauty, dental, orthopaedics. It is a
-configuration key: it selects which dashboard, forms and treatment workflows the clinic gets. A
-clinic has exactly one.
+The single field of practice a tenant declares it operates in — beauty, dental, orthopaedics. It is a
+configuration key: it selects which dashboard, forms and treatment workflows the tenant gets. A clinic
+or a solo doctor's practice has exactly one.
 _Avoid_: Specialty, clinic type, field, discipline
 
 **Specialty**:
@@ -67,3 +67,32 @@ _Avoid_: Zone, body part, region
 What the operator actually did to one Treatment Area in one Treatment Session — the device used, the
 parameters it was set to, how long it took, and any note.
 _Avoid_: Treatment log, area result, shot record
+
+### Dental
+
+**Dental Preset**:
+The package of default data a tenant receives when it declares the dental practice domain — service
+groups, services, resource types and protocols. Defined in code and versioned; it is product content,
+not tenant data.
+_Avoid_: Seed, fixture, template, sample data
+
+**Preset Install**:
+The record that one preset template key became one real row in one tenant. It is what makes installing
+a preset twice a no-op.
+_Avoid_: Migration, sync record, import log
+
+**Tooth Chart**:
+The current condition of every tooth of one patient in one tenant. It is a snapshot, never a history,
+and it holds conditions that predate the tenant — a tooth lost years before the first visit.
+_Avoid_: Odontogram record, dental record, chart entry
+
+**Tooth Site**:
+One tooth, identified by its two-digit FDI number, together with the surfaces of it a service targets.
+It is what a dental service is performed on, and it is not a Treatment Area.
+_Avoid_: Treatment Area, tooth record, position, location
+
+**Treatment Estimate**:
+The priced list of services proposed to a patient across their teeth, which the patient accepts in whole
+or in part. In Persian it is «طرح درمان»; the English name stays distinct because Treatment Plan is
+ambiguous between a Treatment Protocol and a Treatment Case.
+_Avoid_: Treatment plan, quote, proposal, estimate sheet