feat: add visit price requirement feature

- Introduced a new boolean flag `require_visit_price` in the `EntityInsurancePricing` to enforce visit price for appointments.
- Updated the appointment creation endpoints to validate `visit_price_rials` based on the new flag.
- Added `visit_price_rials` field to the `Appointment` entity to store the visit price.
- Enhanced the `PatientService` to validate visit price during session creation.
- Updated API documentation to reflect changes in appointment and insurance pricing.
- Implemented a new service `VisitPriceRequirementResolver` to determine if a visit price is required for a doctor based on their pricing settings.
- Added migrations to update the database schema for the new fields.

docs/api/patient.md

@@ -431,6 +431,7 @@ Creates a new visit session for a patient record.
 
 **Field notes:**
 
+- `visit_price_rials`: هزینه ویزیت (ریال). به‌طور پیش‌فرض اختیاری (پیش‌فرض `0`)؛ اگر فلگ `require_visit_price` در [insurance-pricing](insurance.md) برای tenant فعال باشد، مقدار `> 0` **الزامی** است.
 - `payment_method`: `cash` | `card` | `insurance` | `online` | `pending`
 - `session_at` (اختیاری): زمان پذیرش (unix)؛ اگر نیاید `null` می‌ماند و زمان ثبت (`created_at`) مبنا است.
 - `inventory_package_uuid` (اختیاری): مرجع پکیج مصرفی ([inventory](inventory.md))؛ فقط پکیج متعلق به همان tenant پذیرفته می‌شود، وگرنه بی‌صدا نادیده گرفته می‌شود. روی قیمت اثری ندارد (فقط مرجع).
@@ -459,6 +460,7 @@ Creates a new visit session for a patient record.
 |------|------|-------------|
 | `ERR_PATIENT_NOT_FOUND` | 404 | Record not found or not owned |
 | `ERR_SUBSCRIPTION_REQUIRED` | 403 | No `patient_records` feature |
+| `ERR_VALIDATION_001` | 422 | فلگ `require_visit_price` فعال است ولی `visit_price_rials <= 0` (field: `visit_price_rials`) |
 
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