feat: 打手分内部/外部，内部免审核；支持后台指派打手

- worker_users 新增 worker_type（internal/external，迁移 017）
- 内部打手提交验收后自动通过进入待打款（accepted+结算），外部打手保持后台审核
- 打手管理页支持设为内部/外部并显示类型标签
- 新增后台指派打手：未分配/待抢单工单可指定已注册打手，进入其我的订单并冻结押金
- 指派带审计与事件记录，校验打手状态/接单上限/余额押金

apps/backend/src/repositories/worker-platform/types.ts

@@ -19,6 +19,7 @@ export type WorkerUserRow = {
   phone: string
   level_id: number | null
   status: string
+  worker_type: string
   review_note: string
   session_version: number
   created_at: string
@@ -241,6 +242,7 @@ export type CreateWorkerInput = {
   phone: string
   levelId: number | null
   status: string
+  workerType?: string
   inviterId?: number | null
   inviteCode: string
   now: string

apps/backend/src/repositories/worker-platform/work-order-repo.ts

@@ -859,6 +859,115 @@ export async function grabWorkOrder(input: {
   })
 }
 
+export async function assignWorkOrderToWorker(input: {
+  workOrderId: number
+  workerId: number
+  depositAmount: number
+  maxActiveOrders: number
+  deadlineAt: string | null
+  now: string
+}): Promise<{
+  order: WorkOrderRow | null
+  failureReason:
+    | 'work_order_not_assignable'
+    | 'worker_active_order_limit'
+    | 'worker_deposit_insufficient'
+    | null
+}> {
+  return withTransaction(async (client) => {
+    const currentResult = await client.query<WorkOrderRow>(
+      `
+        SELECT *
+        FROM work_orders
+        WHERE id = $1
+        FOR UPDATE
+      `,
+      [input.workOrderId],
+    )
+    const workOrder = currentResult.rows[0] || null
+    if (
+      !workOrder ||
+      !['unassigned', 'open'].includes(workOrder.status) ||
+      workOrder.assigned_worker_id
+    ) {
+      return { order: null, failureReason: 'work_order_not_assignable' }
+    }
+    const fromStatus = workOrder.status
+
+    await ensureWorkerWalletWithClient(client, input.workerId, input.now)
+    const wallet = await getWorkerWalletWithClient(client, input.workerId)
+    const activeOrderCount = await countWorkerActiveOrdersWithClient(client, input.workerId)
+    if (activeOrderCount >= input.maxActiveOrders) {
+      return { order: null, failureReason: 'worker_active_order_limit' }
+    }
+
+    const available = Number(wallet?.available_amount || 0)
+    if (available < input.depositAmount) {
+      return { order: null, failureReason: 'worker_deposit_insufficient' }
+    }
+
+    await client.query(
+      `
+        UPDATE work_orders
+        SET
+          status = 'in_progress',
+          assigned_worker_id = $1,
+          last_assigned_worker_id = $1,
+          assigned_at = $2,
+          deadline_at = $3,
+          updated_at = $2
+        WHERE id = $4
+      `,
+      [input.workerId, input.now, input.deadlineAt, input.workOrderId],
+    )
+
+    if (input.depositAmount > 0) {
+      const nextAvailable = available - input.depositAmount
+      const nextFrozen = Number(wallet?.frozen_deposit_amount || 0) + input.depositAmount
+      await client.query(
+        `
+          UPDATE worker_wallets
+          SET available_amount = $1, frozen_deposit_amount = $2, updated_at = $3
+          WHERE worker_id = $4
+        `,
+        [nextAvailable, nextFrozen, input.now, input.workerId],
+      )
+      await client.query(
+        `
+          INSERT INTO worker_wallet_ledgers (
+            worker_id, ledger_type, amount, balance_after, frozen_after,
+            related_work_order_id, note, payload_json, created_at
+          ) VALUES ($1, 'deposit_freeze', $2, $3, $4, $5, '后台指派冻结押金', '{}'::jsonb, $6)
+        `,
+        [
+          input.workerId,
+          -input.depositAmount,
+          nextAvailable,
+          nextFrozen,
+          input.workOrderId,
+          input.now,
+        ],
+      )
+    }
+
+    await createWorkOrderEventWithClient(client, {
+      workOrderId: input.workOrderId,
+      actorType: 'admin',
+      actorId: '',
+      eventType: 'assigned_by_admin',
+      fromStatus,
+      toStatus: 'in_progress',
+      payloadJson: JSON.stringify({ workerId: input.workerId, depositAmount: input.depositAmount }),
+      now: input.now,
+    })
+
+    return {
+      order: await getWorkOrderByIdWithClient(client, input.workOrderId),
+      failureReason: null,
+    }
+  })
+}
+
 export async function cancelWorkerWorkOrder(input: {
   workOrderId: number
   workerId: number

apps/backend/src/repositories/worker-platform/worker-repo.ts

@@ -159,9 +159,9 @@ export async function createWorkerUser(input: CreateWorkerInput): Promise<Worker
       `
         INSERT INTO worker_users (
           username, password_hash, display_name, phone, level_id, status,
-          inviter_id, invite_code,
+          worker_type, inviter_id, invite_code,
           created_at, updated_at
-        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
+        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
         RETURNING id
       `,
       [
@@ -171,6 +171,7 @@ export async function createWorkerUser(input: CreateWorkerInput): Promise<Worker
         input.phone,
         input.levelId,
         input.status,
+        input.workerType || 'external',
         input.inviterId || null,
         input.inviteCode,
         input.now,
@@ -188,7 +189,13 @@ export async function updateWorkerUser(
   patch: Partial<
     Pick<
       WorkerUserRow,
-      'status' | 'review_note' | 'level_id' | 'session_version' | 'updated_at' | 'reviewed_at'
+      | 'status'
+      | 'worker_type'
+      | 'review_note'
+      | 'level_id'
+      | 'session_version'
+      | 'updated_at'
+      | 'reviewed_at'
     >
   >,
 ): Promise<WorkerUserRow | null> {
@@ -201,15 +208,17 @@ export async function updateWorkerUser(
       UPDATE worker_users
       SET
         status = $1,
-        review_note = $2,
-        level_id = $3,
-        session_version = $4,
-        reviewed_at = $5,
-        updated_at = $6
-      WHERE id = $7
+        worker_type = $2,
+        review_note = $3,
+        level_id = $4,
+        session_version = $5,
+        reviewed_at = $6,
+        updated_at = $7
+      WHERE id = $8
     `,
     [
       next.status,
+      next.worker_type || 'external',
       next.review_note || '',
       next.level_id || null,
       Number(next.session_version || 1),