feat(appointment): expose weekly opening hours per booking location

The booking-locations endpoint described where a doctor can be booked but not
when, so the public site had no way to emit openingHoursSpecification and had
to fall back to availableService alone.

Each location now carries opening_hours: its active weekly shifts flattened,
with the English weekday name so the consumer can map it onto schema.org
directly. A day with two shifts appears twice; days with no active shift are
omitted. Hours are per context, so the personal practice and each clinic report
their own.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/api/appointment.md

@@ -737,6 +737,9 @@ location — picking one and hiding the rest removes real capacity from the doct
         "clinic_uuid": null,
         "booking_mode": "slot",
         "buffer_minutes": 0,
+        "opening_hours": [
+          { "day": "Saturday", "opens": "09:00", "closes": "13:00" }
+        ],
         "services": [],
         "next_available_at": 1755000000
       },
@@ -748,6 +751,10 @@ location — picking one and hiding the rest removes real capacity from the doct
         "clinic_uuid": "41e325c4-e825-4067-8438-5d828ecaee09",
         "booking_mode": "service",
         "buffer_minutes": 10,
+        "opening_hours": [
+          { "day": "Saturday", "opens": "09:00", "closes": "13:00" },
+          { "day": "Sunday",   "opens": "16:00", "closes": "20:00" }
+        ],
         "services": [
           { "uuid": "…", "name": "ویزیت", "duration_minutes": 20, "price_rials": 500000,
             "service_section": { "uuid": "…", "name": "عمومی" } }
@@ -764,6 +771,7 @@ location — picking one and hiding the rest removes real capacity from the doct
 | `location_uuid` | `string\|null` | the `DoctorAddress` uuid; `null` when the context has no address yet |
 | `type` | `"personal" \| "clinic"` | |
 | `booking_mode` | `"slot" \| "service"` | per-context — the same doctor can differ between locations |
+| `opening_hours` | `array` | active weekly shifts of that context, flattened; `day` is the English weekday name so it maps straight onto schema.org `openingHoursSpecification` |
 | `services` | `array` | populated only in `service` mode, scoped to that context's owner |
 | `next_available_at` | `int\|null` | Unix timestamp of the earliest free slot within 30 days |
 
@@ -773,5 +781,11 @@ selection; locations with no capacity sort last. Deep links should carry the cho
 
 **Status codes:** `200`, `404 ERR_VALIDATION_002` (doctor not found).
 
-**Consumer:** `nobat724_front` — the doctor page must render one booking block per entry and pass the
-matching `clinic_uuid` into the slot and booking calls.
+`opening_hours` lists one entry per active shift, so a day with a morning and an evening shift
+appears twice. Days with no active shift are absent. Times are local `HH:MM` strings, and the
+per-shift `location_id` is not repeated here — every shift in an entry already belongs to that
+location's context.
+
+**Consumer:** `nobat724_front` — the doctor page must render one booking block per entry, pass the
+matching `clinic_uuid` into the slot and booking calls, and feed `opening_hours` into the
+`openingHoursSpecification` of each `MedicalClinic` in the Physician JSON-LD.