feat(services): match Figma خدمات page in settings shell + multi-staff

Render the clinic services page (sections → services) inside the settings
sub-navigation shell (SettingsLayout, "خدمات" active) to match the Figma
settings design. Restyle section cards to show the service count and a
status toggle with edit/delete actions, and service cards with labelled
price/duration and personnel chips.

A service can now have multiple personnel: add an additive many-to-many
ServiceItem↔ClinicStaff (staffMembers, EAGER) while keeping the legacy
single `staff` column mirrored for backward compatibility. Endpoints accept
`staff_uuids[]` (falling back to the legacy single `staff_uuid`) and return
`staff_members[]`; the section list now reports `items_count`.

Backfill-safe: pre-migration rows fall back to the single staff in toArray.

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

assets/admin/types/index.ts

@@ -421,13 +421,18 @@ export interface ServiceSection {
     uuid: string;
     name: string;
     active: boolean;
+    /** number of services in this section (only present in the list endpoint) */
+    items_count?: number;
 }
 
 export interface ServiceItem {
     uuid: string;
     name: string;
     price_rials: number;
+    /** primary staff (first member) — kept for backward compatibility */
     staff: { uuid: string; full_name: string } | null;
+    /** all personnel assigned to this service */
+    staff_members?: { uuid: string; full_name: string }[];
     active: boolean;
     insurance_covered?: boolean;
     insurance_price_rials?: number | null;