feat(webhook): Phase 4 — admin-ui /webhooks page

Routes:
- /webhooks (layout) → /webhooks/index (list) + /webhooks/$id (detail)
- nav link добавлен в __root.tsx между Outbox и Language switch

List page (webhooks.index.tsx):
- Table: name | URL | scope filter (colored dots) | dictionaries | status
- ScopeChips reuse SCOPE_DOT из lib/scope-style.ts (consistency с
  dictionaries scope coloring)
- Create dialog: name, URL, scope filter (MultiSelect), dictionary &
  event type (CSV inputs), description. Client-side validation
  (URL scheme, name required) дублирует server-side @Pattern.
- Secret reveal modal после create: warning + plaintext + copy button.
  Single-time view — после закрытия secret не получить, только rotate.

Detail page (webhooks.$id.tsx):
- Subscription metadata grid (URL, status, filters, masked secret,
  createdBy + timestamp)
- Action buttons: rotate-secret + delete (с confirmation)
- Delivery history table: outboxEventId | status badge (delivered/
  retrying/pending/dlq) | attempts | last attempt | HTTP code | error
- Pagination 50/page
- Status badges: delivered=success, retrying=warning, pending=neutral,
  dlq=error

API client (queries + mutations):
- 4 queries: subscriptions list, subscription by id, deliveries page,
  DLQ page (last unused в UI пока, но готов для admin DLQ tab)
- 4 mutations: create, update, delete, rotateSecret. Все invalidate
  правильные query keys.

i18n: 50 ключей × 2 локали (ru-RU + en-US) под webhooks.*

ordinis-admin-ui/src/api/client.ts

@@ -173,3 +173,56 @@ export type DlqPage = {
   number: number
   size: number
 }
+
+// === Webhooks (v2) ===
+
+export type WebhookSubscription = {
+  id: string
+  name: string
+  url: string
+  scopeFilter?: DataScope[] | null
+  dictionaryFilter?: string[] | null
+  eventTypeFilter?: string[] | null
+  /** Masked `sk_****<last4>` или plaintext только в response создания/rotate. */
+  hmacSecret: string
+  active: boolean
+  createdAt: string
+  createdBy: string
+  updatedAt: string
+  description?: string | null
+}
+
+export type CreateWebhookSubscriptionRequest = {
+  name: string
+  url: string
+  scopeFilter?: DataScope[]
+  dictionaryFilter?: string[]
+  eventTypeFilter?: string[]
+  active?: boolean
+  description?: string
+}
+
+export type WebhookDeliveryStatus = 'pending' | 'retrying' | 'delivered' | 'dlq'
+
+export type WebhookDelivery = {
+  id: number
+  subscriptionId: string
+  outboxEventId: number
+  status: WebhookDeliveryStatus
+  attemptCount: number
+  createdAt: string
+  nextAttemptAt: string
+  lastAttemptAt?: string | null
+  deliveredAt?: string | null
+  lastError?: string | null
+  lastStatusCode?: number | null
+  dlqAt?: string | null
+}
+
+export type WebhookDeliveryPage = {
+  content: WebhookDelivery[]
+  totalElements: number
+  totalPages: number
+  number: number
+  size: number
+}