Backoffice stage 3: orders and providers, auto-assignment

- Auto-assignment: a new order is offered to the best free provider (same ranking as
  the dispatcher hint); a decline or timeout passes it to the next one; nobody is
  offered the same order twice; after N tries it waits for a dispatcher and the team
  is notified once. The worker retries waiting orders every minute. Settings
  assign.auto / assign.maxAutoOffers (toggle on the Orders page, checkbox in old admin).
- Orders: list by day with groups (need a provider, offered, assigned, in progress,
  done, cancelled), periods and search; order card with progress, provider or ranked
  candidates ("offer" / "pick automatically"), details, checklist and photos,
  history in plain words, client, money (superadmin), payment, status change,
  reschedule (slots or custom time), cancel with fee.
- New order for a client (from the client card or the Orders page): params form,
  address, free slots for 14 days, price with the client's discount.
- Providers: list with rating, orders, declines, low ratings, next order; card with
  quality, ratings, upcoming orders, schedule and districts, admission documents,
  block/unblock with reason, new bot link, money and payouts (superadmin).
- Payout gets paidAt/note/createdById; Provider gets blockedReason/blockedAt/adminNote
  and documents (ProviderDoc).
- Tests for auto-assignment.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

packages/i18n/locales/zh.json

@@ -871,7 +871,8 @@
       "file": "文件",
       "chatAssigned": "{{by}} 将对话转交给你：{{name}}",
       "order": "订单 #{{number}}",
-      "noOrder": "当前没有订单"
+      "noOrder": "当前没有订单",
+      "autoFailed": "订单 #{{number}} 没有找到空闲的服务人员，请手动分配。"
     },
     "partner": {
       "valid": "{{name}} — {{level}}，会员卡有效",
@@ -1269,7 +1270,9 @@
       "residence_escortFrom": "居留许可：陪同办理起价，֏",
       "residence_stateFee": "居留许可：1年国家规费，֏",
       "transfer_standardPrice": "接机「标准」，֏",
-      "transfer_premiumPrice": "接机「高级」，֏"
+      "transfer_premiumPrice": "接机「高级」，֏",
+      "assign_auto": "自动分配订单",
+      "assign_maxAutoOffers": "自动尝试的服务人员数量"
     },
     "presets": {
       "add": "添加方案",