feat(exc): 专长交易 read-only monitoring pages

New nav group with four pages against the Exc admin API:
- /exc/demands — status/mode filters, detail sheet with related
  services, quotes and dispatch rounds
- /exc/dispatches — status/round filters
- /exc/orders — status/payment filters, detail sheet with items and
  状态流转 audit trail
- /exc/providers — status/verified filters, detail sheet with dispatch
  settings and status logs

Co-Authored-By: Claude Fable 5 <[email protected]>

src/api/types.ts

@@ -351,3 +351,187 @@ export interface RetranslateResult {
   translation_version_id: number
   queued_blocks: number
 }
+
+// --- Exc 专长交易（只读监控）---
+
+export interface ExcUser {
+  uid: string
+  display_name?: string | null
+}
+
+export type ExcDemandStatus =
+  | 'draft'
+  | 'open'
+  | 'quotation_closed'
+  | 'order_placed'
+  | 'fulfilled'
+  | 'broadcasting'
+  | 'matched'
+  | 'converted'
+  | 'expired'
+  | 'canceled'
+
+export type ExcDispatchMode = 'instant_accept' | 'quote' | 'scheduled_booking' | 'manual_selection'
+
+export interface ExcDemand {
+  kind?: string
+  id: number
+  title?: string | null
+  status: ExcDemandStatus
+  dispatch_mode?: ExcDispatchMode | null
+  service_type?: string | null
+  buyer?: ExcUser | null
+  category_id?: string | null
+  currency_code?: string | null
+  ref_amount?: number | null
+  matched_provider_uid?: string | null
+  matched_at?: string | null
+  quotes_count: number
+  dispatches_count: number
+  required_at?: string | null
+  published_at?: string | null
+  created_at?: string
+  // detail-only
+  summary?: string | null
+  content?: string | null
+  address?: unknown
+  quote_deadline?: string | null
+  related_services?: Array<{ id: number; title?: string | null; category_name?: string | null }>
+  quotes?: Array<{
+    id: number
+    user_uid: string
+    price: number
+    currency_code?: string
+    message?: string | null
+    user?: ExcUser | null
+    created_at?: string
+  }>
+  dispatches?: ExcDemandDispatchRow[]
+}
+
+export interface ExcDemandDispatchRow {
+  id: number
+  provider?: ExcUser | null
+  round_no: number
+  status: ExcDispatchStatus
+  score?: number | null
+  distance_meters?: number | null
+  eta_minutes?: number | null
+  responded_at?: string | null
+}
+
+export type ExcDispatchStatus =
+  | 'sent'
+  | 'delivered'
+  | 'viewed'
+  | 'accepted'
+  | 'rejected'
+  | 'ignored'
+  | 'expired'
+  | 'taken_by_other'
+
+export interface ExcDispatch {
+  kind?: string
+  id: number
+  demand?: { id: number; title?: string | null } | null
+  provider?: ExcUser | null
+  round_no: number
+  status: ExcDispatchStatus
+  score?: number | null
+  similarity?: number | null
+  distance_meters?: number | null
+  eta_minutes?: number | null
+  auto_grab_eligible: boolean
+  sent_at?: string | null
+  viewed_at?: string | null
+  responded_at?: string | null
+  expires_at?: string | null
+}
+
+export type ExcOrderStatus =
+  | 'created'
+  | 'confirmed'
+  | 'started'
+  | 'consumed'
+  | 'paid'
+  | 'fulfilled'
+  | 'canceled'
+
+export interface ExcOrder {
+  kind?: string
+  id: number
+  title?: string | null
+  status: ExcOrderStatus
+  payment_status?: 'UNPAID' | 'PAID' | null
+  buyer?: ExcUser | null
+  provider?: ExcUser | null
+  currency_code?: string | null
+  total_amount?: number | null
+  actual_total_amount?: number | null
+  platform_fee_amount?: number | null
+  provider_net_amount?: number | null
+  commission_rate?: number | null
+  cancellation_fee_amount?: number | null
+  paid_at?: string | null
+  settled_at?: string | null
+  escrow_release_at?: string | null
+  escrow_released_at?: string | null
+  order_date?: string | null
+  created_at?: string
+  // detail-only
+  buyer_remarks?: string | null
+  pay_order_no?: string | null
+  paid_channel?: string | null
+  items?: Array<{
+    id: number
+    name?: string | null
+    status?: string
+    price?: number
+    quantity?: number
+    line_total?: number
+    service_type?: string
+  }>
+  transactions?: Array<{
+    id: number
+    previous_status?: string | null
+    new_status?: string
+    changed_by?: string | null
+    changed_by_type?: string | null
+    reason?: string | null
+    changed_at?: string
+  }>
+}
+
+export type ExcProviderStatus = 'offline' | 'online' | 'inactive' | 'busy'
+
+export interface ExcProvider {
+  kind?: string
+  user?: ExcUser | null
+  user_uid: string
+  status: ExcProviderStatus
+  is_disabled: boolean
+  is_verified: boolean
+  rating?: number | null
+  completed_jobs?: number | null
+  online_at?: string | null
+  offline_at?: string | null
+  last_location_at?: string | null
+  current_service_order_id?: number | null
+  created_at?: string
+  // detail-only
+  dispatch_setting?: {
+    auto_grab_enabled?: boolean
+    service_whitelist?: string[]
+    min_price?: number | null
+    max_radius_meters?: number | null
+    max_eta_minutes?: number | null
+    daily_accept_cap?: number | null
+    accepted_today?: number
+  } | null
+  status_logs?: Array<{
+    from_status?: string | null
+    to_status?: string
+    reason?: string | null
+    created_at?: string
+  }>
+}