feat(representation): let registering reps edit their doctors and clinics

A representative could create a doctor or clinic but not finish its profile:
PATCH /api/v1/doctor/{uuid} accepted only the doctor or an admin, and the
clinic gate ran through ClinicDoctorPermissionChecker, which asks about clinic
membership — a representative is not a member. Onboarding stopped at an empty
public record.

Grant is permanent while representation_id points at the rep, and limited to
content: RepresentationEditPolicy holds ownership plus the field whitelist.
Sending a key outside it aborts the whole request with 403 and names the field,
rather than filtering the payload silently, so a rep never believes a change
saved when it did not. medical_system_code, `active` and clinic `doctors` stay
out — credential, and membership, belong to the record's owner. `active` already
has a dedicated rep endpoint.

ClinicDoctorPermissionChecker is untouched on purpose; folding a second concept
into it would give it two reasons to change.

Doctor/clinic detail responses now carry can_edit, computed by the same policy
the PATCH gate uses, so the panel reads authorization instead of re-deriving it
and drifting. Both endpoints stay public: no token means can_edit false and an
otherwise unchanged payload, which is what nobat724_front consumes.

Address endpoints follow the same policy. createAddress now resolves its target
from an explicit doctor_uuid instead of findByUser first — a representative who
also has a doctor profile was silently writing the address onto their own.

Every rep edit writes one app_log row (channel representation_edit) recording
who, what, and which field names — never values. Owner and admin edits write
nothing, keeping /admin/logs readable.

Docs corrected where they already disagreed with the code: 403/404 error codes
on both PATCH routes, a non-existent "cannot delete the last clinic address"
409, and the missing gallery-size 422.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

assets/admin/types/index.ts

@@ -77,6 +77,8 @@ export interface ClinicDetail {
     map: { latitude: string | null; longitude: string | null };
     "24_7": boolean;
     field_working_days: string | null;
+    /** آیا کاربر جاری اجازهٔ ویرایش دارد؟ سرور تصمیم می‌گیرد، نه کلاینت. */
+    can_edit?: boolean;
 }
 
 export type AppointmentStatus =