feat(privacy): keep venue phone numbers out of every public response

A doctor's office number sat next to the address on the public profile and in
the anonymous API payload, so harvesting the phone number of every practice in
the country was one unauthenticated request away. Street address and map
coordinates stay public — a patient needs those to find the place — but the
phone is now opt-in per caller: DoctorAddress::toArray() and the clinic
serializers only emit it when told to, and the public doctor/clinic endpoints
tell them to only when the caller may edit that profile (the same can_edit they
already compute). Owner-facing address CRUD keeps returning it unchanged.

The patient still gets the number where it is actually useful — their own
appointment. That payload also stops guessing: it used to serialise the
doctor's *first* address, so a booking made at the clinic or at a second office
showed the wrong street entirely. It now resolves the address recorded on the
appointment itself, which works the same for a personal office and a clinic
branch, and falls back to the clinic's own number when the address has none.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/api/appointment.md

@@ -459,7 +459,13 @@ Get appointment detail.
   }
 }
 ```
-> `doctor.specialties` آرایه (ممکن است خالی)؛ `address` اولین آدرس پزشک است (ممکن است `null` اگر پزشک آدرسی ندارد). `address.map.latitude/longitude` رشته یا `null`. تاریخ‌ها Unix.
+
+> ℹ️ `address` is the venue recorded on this appointment (`address_id`) — the doctor's own
+> office or the clinic branch, whichever the booking was made at — and it is the only place
+> `telephone` is returned. When that record carries no number, the clinic's own number takes
+> its place. Public doctor and clinic responses never carry a phone number.
+
+> `doctor.specialties` آرایه (ممکن است خالی)؛ `address` آدرسِ ثبت‌شدهٔ همین نوبت است و برای نوبت‌های قدیمیِ بدون `address_id` ممکن است `null` باشد. `address.map.latitude/longitude` رشته یا `null`. تاریخ‌ها Unix.
 
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