feat(admin): session edit form, payment edit/delete UI, and audit history modal

- SessionServiceCard menu gains «ویرایش» and «تاریخچه تغییرات» items.
- SessionAuditModal shows the session's change history (field, op badge,
  old->new, actor, time) from /session/{uuid}/audit-log.
- PaymentStep payment rows get edit (modal) + delete (confirm) controls for
  non-wallet payments, calling the new PATCH/DELETE payment endpoints.
- CreateStep accepts an editSession prop (prefill + PATCH); EditSessionPage
  reuses it at /patients/:recordUuid/session/:sessionUuid/edit.

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

assets/admin/types/index.ts

@@ -153,6 +153,16 @@ export interface DiscountRule {
     updated_at: number;
 }
 
+export interface SessionAuditEntry {
+    field: string;
+    operation: 'create' | 'update' | 'delete';
+    old_value: string | null;
+    new_value: string | null;
+    actor_name: string | null;
+    note: string | null;
+    created_at: number;
+}
+
 export interface DiscountSuggestion {
     rule_uuid: string;
     rule_name: string;