feat(branch): admin UI for branch working hours and rooms, plus real API docs

Three pages, all on the existing design system: BranchesPage lists the current
environment's booking locations with their working-hours and active-room counts,
and two subpages edit the week and the rooms. The list page deliberately does not
create or rename a branch — clinic and doctor detail pages already do that, and
duplicating it would give one physical place two edit surfaces. Route permission
reuses `appointment_settings` rather than inventing a new one.

Two real bugs fell out of exercising this end to end:

`days` was serialising as a JSON *array*, not an object keyed "0".."6" — keys 0..6
are sequential so json_encode collapses them to a list. The client reads days["0"]
either way, so nothing looked broken, but the response shape was unstable: one
missing day would flip the same field to an object. The controller now casts to
stdClass and WorkingHoursTest::testDaysIsAJsonObjectNotAnArray pins it. Found by
curling the endpoint for the docs, not by any test.

`<input type="time">` caps at 23:59, so it can neither display nor produce the
legal end value 1440. An all-day range would have vanished from the form and been
corrupted by the first save. Ranges now carry an explicit end-of-day flag, with a
round-trip test proving 1440 survives.

docs/api/branch.md documents all eight endpoints with responses captured from real
curl runs against ddev, including the 422 and 404 bodies. doctor.md records that
active/timezone now appear on all nine existing address endpoints (additive), and
tenancy.md gains the two lessons this task taught: an aggregate child whose root is
itself declared global inherits no environment and needs a real pair, and
TenantFilter is not a substitute for an explicit ownership check because hard
isolation only applies to a *chosen* context.

Verified: phpunit 1067 tests / 2974 assertions green; slot-mode frozen contract
green; phpstan 14 errors before and after, none in touched files; tsc clean;
vitest 87 files / 612 tests green.

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

docs/api/README.md

@@ -82,6 +82,7 @@ Only **digits** are translated — no characters are stripped, so `IR` in a sheb
 | [doctor.md](doctor.md) | Doctor profile & addresses | 11 |
 | [clinic.md](clinic.md) | Clinics | 7 |
 | [clinic-invitation.md](clinic-invitation.md) | Doctor invitations to clinics | 8 |
+| [branch.md](branch.md) | Branches (= addresses), working hours, rooms | 8 |
 | [appointment.md](appointment.md) | Appointments & slot booking | 6 |
 | [appointment-settings.md](appointment-settings.md) | Weekly schedule, date overrides, holidays | 14 |
 | [payment.md](payment.md) | Payments (Mellat / Sep) | 5 |