feat(stocktake): 抽盘范围改为「系统推荐 + 人工在库位树上勾选」

【后端】
- 新增 GET /stocktake/recommend-locations?days=30&top_n=50
  调 get_active_locations 返回推荐库位 full_path 列表 + moves/sku_count/
  last_move 明细。只推荐不落库，days/top_n 做范围钳制（1~365 / 1~500）。
- /draft/start-new 在 scope_type=active 时不再自行计算活跃库位，改为读取
  payload 的 scope_config.locations 并校验归一化（去空白、去重、保序、
  空列表 400、上限 2000）。范围决定权交还前端 UI —— 否则用户手改的勾选
  会被后端覆盖。

【前端】欢迎页选中「活跃库位抽盘」时展开配置区：
- 「近 30 天最活跃的前 [N] 个库位」+【获取推荐】
- el-tree（show-checkbox）数据取自 /v1/warehouse/tree，按公司前缀过滤
  （IRIS 只留 Y*，LICA 只留 C*/L*，复用 getAllowedLocPrefixes）
- 获取推荐后 setCheckedKeys 自动勾选；用户可自由增删
- 提交时 getCheckedNodes().map(n => n.full_path) 打包进 scope_config.locations

两个实现细节：
- 推荐里有、但树上勾不到的库位（不在当前公司前缀内等）会明确告警并打印，
  不让它们静默落选 —— 否则工人以为盘到了、实际没进范围。
- 已选库位数实时显示，因为 el-tree 默认级联：勾一个父节点会连带勾中整棵
  子树，规模可能远超推荐数量，需要让用户看得见。

实测:
  recommend-locations(top_n=10) → 10 个库位 + 明细
  start-new 传 3 个库位 → 落库正是这 3 个，总品项 36（全仓 1126）
  不传 locations → 400；勾选为空 → 400
  公司前缀过滤: IRIS→8 个(Y1~Y8)，LICA→25 个，无越界

inventory-backend/app/api/v1/inbound/stock.py

@@ -984,6 +984,48 @@ def get_stocktake_companies():
         return jsonify({'code': 500, 'msg': str(e)}), 500
 
 
+@bp.route('/stocktake/recommend-locations', methods=['GET'])
+@permission_required('inventory_stocktake')
+def recommend_locations():
+    """
+    推荐近 N 天最活跃的库位 —— 供前端「活跃库位抽盘」的树形勾选做预选。
+
+    ★ 只推荐、不落库。最终范围由用户在库位树上微调后，随 /draft/start-new
+      的 scope_config.locations 一并提交，决定权在前端 UI。
+
+    查询参数: days(默认30) / top_n(默认50)
+    返回: { locations: [full_path...], detail: [{location,moves,sku_count,last_move}], days, top_n }
+    """
+    company_name = get_current_company_filter()
+    if not company_name or company_name == '__NO_COMPANY__':
+        return jsonify({'code': 400, 'msg': '请先选择公司，再获取推荐库位'}), 400
+
+    try:
+        days = int(request.args.get('days', 30))
+        top_n = int(request.args.get('top_n', 50))
+    except (TypeError, ValueError):
+        return jsonify({'code': 400, 'msg': 'days / top_n 必须是整数'}), 400
+
+    # 防御性上限，避免把整库扫进来
+    days = max(1, min(days, 365))
+    top_n = max(1, min(top_n, 500))
+
+    try:
+        locs = get_active_locations(company_name, days=days, top_n=top_n)
+        return jsonify({
+            'code': 200,
+            'data': {
+                'locations': [x['location'] for x in locs],
+                'detail': locs,
+                'days': days,
+                'top_n': top_n,
+            }
+        }), 200
+    except Exception as e:
+        traceback.print_exc()
+        return jsonify({'code': 500, 'msg': str(e)}), 500
+
+
 @bp.route('/draft/active-session', methods=['GET'])
 @permission_required('inventory_stocktake')
 def get_active_session():
@@ -1117,24 +1159,34 @@ def start_new_session():
     #   必须在创建会话这一刻算好并落库 —— all-items 与 generate-missing 稍后都要
     #   读同一份范围；若各自实时计算，两次调用之间库位活跃度变化会导致范围漂移，
     #   结束盘点时就会把「开单时在范围内、比对时已掉出范围」的库存误判成盘亏。
+    # ★ 抽盘：范围由**前端**决定（系统推荐 + 人工在库位树上微调后提交），
+    #   后端只做校验与归一化，不再自行计算 —— 否则用户手改的勾选会被覆盖。
     if scope_type == STOCKTAKE_SCOPE_ACTIVE:
-        try:
-            days = int(scope_config.get('days') or 30)
-            top_n = int(scope_config.get('top_n') or 50)
-        except (TypeError, ValueError):
-            return jsonify({"message": "days / top_n 必须是整数"}), 400
-
-        active_locs = get_active_locations(company_name, days=days, top_n=top_n)
-        if not active_locs:
+        raw_locs = scope_config.get('locations')
+        if not isinstance(raw_locs, list):
             return jsonify({
-                "message": f"最近 {days} 天内没有找到活跃库位，无法创建抽盘任务"
+                "message": "抽盘必须通过 scope_config.locations 提交库位列表（可先调 /stocktake/recommend-locations 拿推荐）"
+            }), 400
+
+        # 归一化：去空白、去重、保序
+        clean_locs, seen = [], set()
+        for x in raw_locs:
+            s = str(x).strip()
+            if s and s not in seen:
+                seen.add(s)
+                clean_locs.append(s)
+
+        if not clean_locs:
+            return jsonify({"message": "抽盘至少要勾选一个库位"}), 400
+        if len(clean_locs) > 2000:
+            return jsonify({
+                "message": f"单次抽盘最多 2000 个库位，当前 {len(clean_locs)} 个"
             }), 400
 
         scope_config = {
-            'days': days,
-            'top_n': top_n,
-            'locations': [x['location'] for x in active_locs],
-            'detail': active_locs,
+            'locations': clean_locs,
+            'recommend_days': scope_config.get('recommend_days'),
+            'recommend_top_n': scope_config.get('recommend_top_n'),
             'computed_at': beijing_time().strftime('%Y-%m-%d %H:%M:%S'),
         }
 

inventory-web/src/views/stock/stocktake/index.vue

@@ -94,8 +94,47 @@
               <div class="task-form-hint">
                 {{ newMode === 'blind' ? '盲盘：作业时不显示账面数与差异' : '明盘：作业时可查看账面数与差异' }}
               </div>
-              <div v-if="newScopeType === 'active'" class="task-form-hint">
-                抽盘：仅盘点近 30 天有出入库/借还记录的前 50 个活跃库位
+
+              <!-- ★ 抽盘范围：系统推荐 + 人工在库位树上勾选微调，最终范围以勾选结果为准 -->
+              <div v-if="newScopeType === 'active'" class="scope-panel">
+                <div class="scope-recommend-row">
+                  <span class="scope-recommend-text">近 {{ RECOMMEND_DAYS }} 天最活跃的前</span>
+                  <el-input-number
+                      v-model="recTopN"
+                      :min="1"
+                      :max="500"
+                      size="small"
+                      controls-position="right"
+                      class="scope-topn-input"
+                  />
+                  <span class="scope-recommend-text">个库位</span>
+                  <el-button
+                      type="primary"
+                      plain
+                      size="small"
+                      :loading="recLoading"
+                      @click="fetchRecommendLocations"
+                  >
+                    获取推荐
+                  </el-button>
+                </div>
+
+                <el-tree
+                    ref="locTreeRef"
+                    v-loading="treeLoading"
+                    class="scope-tree"
+                    :data="locTreeData"
+                    node-key="full_path"
+                    show-checkbox
+                    default-expand-all
+                    :props="{ label: 'name', children: 'children' }"
+                    @check="updateCheckedLocCount"
+                />
+
+                <div class="scope-selected">
+                  已选 <strong>{{ checkedLocCount }}</strong> 个库位
+                  <el-button link type="primary" size="small" @click="resetScopeSelection">清空</el-button>
+                </div>
               </div>
               <div v-if="creatingNew" class="task-form-warn">
                 ⚠️ 开启新一轮将<strong>终结当前会话</strong>：已扫数据完整保留，但其他设备不能再加入该会话
@@ -536,8 +575,10 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed, onMounted, onUnmounted, nextTick } from 'vue'
+import { ref, computed, onMounted, onUnmounted, nextTick, watch } from 'vue'
 import { getAllStocktakeItems, getDraftMergedList, updateStocktakeQuantity, scanStockByBarcode, getStocktakeCompanies } from '@/api/inbound/stock'
+import { getWarehouseTree } from '@/api/common/warehouse'
+import { getAllowedLocPrefixes } from '@/utils/warehouseCompany'
 import QrScanner from '@/components/QrScanner/index.vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import { Search, VideoPlay, VideoPause, List, Checked, Download, ArrowRight, Cloudy, Edit, EditPen, CameraFilled, Close, WarningFilled } from '@element-plus/icons-vue'
@@ -680,6 +721,112 @@ const SCOPE_LABELS: Record<string, string> = { full: '全仓盘点', active: '
 const modeLabel = (m?: string | null) => (m ? MODE_LABELS[m] || m : '')
 const scopeLabel = (s?: string | null) => (s ? SCOPE_LABELS[s] || s : '')
 
+// ★ 抽盘范围：系统推荐 + 人工在库位树上微调
+const RECOMMEND_DAYS = 30
+const recTopN = ref(50)            // 推荐「近 N 天最活跃的前 X 个库位」中的 X
+const recLoading = ref(false)      // 获取推荐中
+const treeLoading = ref(false)     // 库位树加载中
+const locTreeData = ref<any[]>([]) // 库位树（已按当前公司前缀过滤）
+const locTreeRef = ref()           // el-tree 实例，用于 setCheckedKeys / getCheckedNodes
+const checkedLocCount = ref(0)     // 当前勾选的库位数（含父节点，实时展示避免误判规模）
+
+// 库位树按公司前缀过滤（IRIS 只看 Y，LICA 看 C/L；未配置的公司不过滤）
+const filterTreeByCompany = (nodes: any[], company: string) => {
+  const prefixes = getAllowedLocPrefixes(company)
+  if (!prefixes.length) return nodes
+  return nodes.filter((n: any) =>
+      prefixes.some((p: string) => String(n?.name || '').toUpperCase().startsWith(p.toUpperCase()))
+  )
+}
+
+const loadLocationTree = async () => {
+  if (locTreeData.value.length) return
+  treeLoading.value = true
+  try {
+    const res: any = await getWarehouseTree()
+    const raw = res?.data || []
+    locTreeData.value = filterTreeByCompany(raw, selectedCompany.value)
+  } catch (e) {
+    console.error('获取库位树失败', e)
+    ElMessage.error('获取库位树失败')
+    locTreeData.value = []
+  } finally {
+    treeLoading.value = false
+  }
+}
+
+const updateCheckedLocCount = () => {
+  const nodes = locTreeRef.value?.getCheckedNodes() || []
+  checkedLocCount.value = nodes.length
+}
+
+// 取推荐并把它们在树上自动勾选
+const fetchRecommendLocations = async () => {
+  if (!selectedCompany.value) {
+    ElMessage.warning('请先选择公司')
+    return
+  }
+  recLoading.value = true
+  try {
+    // 先把树准备好，否则 setCheckedKeys 对尚未渲染的节点无效
+    await loadLocationTree()
+    await nextTick()
+
+    const res: any = await request({
+      url: '/v1/inbound/stock/stocktake/recommend-locations',
+      method: 'get',
+      params: withCompany({ days: RECOMMEND_DAYS, top_n: recTopN.value })
+    })
+    const locs: string[] = res?.data?.locations || []
+    if (!locs.length) {
+      ElMessage.warning(`最近 ${RECOMMEND_DAYS} 天没有找到活跃库位`)
+      return
+    }
+
+    // false = 不触发子节点级联之外的行为，按 el-tree 默认规则勾选
+    locTreeRef.value?.setCheckedKeys(locs, false)
+    updateCheckedLocCount()
+
+    // 推荐里有、但树上勾不到的（不在当前公司前缀范围内等）要如实告知，
+    // 否则这些库位会静默落选 —— 工人以为盘到了，其实没进范围
+    const checkedPaths = new Set(
+        (locTreeRef.value?.getCheckedNodes() || []).map((n: any) => n.full_path)
+    )
+    const missing = locs.filter(l => !checkedPaths.has(l))
+    if (missing.length) {
+      ElMessage.warning(`推荐中 ${missing.length} 个库位不在当前公司的库位树上，未能勾选`)
+      console.warn('未能勾选的推荐库位:', missing)
+    } else {
+      ElMessage.success(`已勾选 ${locs.length} 个推荐库位`)
+    }
+  } catch (e: any) {
+    ElMessage.error(e?.response?.data?.message || e?.message || '获取推荐库位失败')
+  } finally {
+    recLoading.value = false
+  }
+}
+
+// 收集树上勾选的库位 full_path，作为抽盘范围提交
+const buildScopeConfig = () => {
+  const nodes = locTreeRef.value?.getCheckedNodes() || []
+  return {
+    locations: nodes.map((n: any) => n.full_path).filter(Boolean),
+    recommend_days: RECOMMEND_DAYS,
+    recommend_top_n: recTopN.value
+  }
+}
+
+// 切换回全仓时清空树上的勾选，避免残留到下一次抽盘
+const resetScopeSelection = () => {
+  locTreeRef.value?.setCheckedKeys([], false)
+  checkedLocCount.value = 0
+}
+
+watch(newScopeType, (val) => {
+  if (val === 'active') loadLocationTree()
+  else resetScopeSelection()
+})
+
 const persistSession = (sessionId: string) => {
   currentSessionId.value = sessionId || ''
   if (sessionId) {
@@ -773,7 +920,7 @@ const api = {
     data: { ...data, session_id: currentSessionId.value }
   }),
   // ★ 新增: 开始新会话（携带盘点模式与范围配置，由后端落库到 stocktake_session）
-  startNewSession: (payload: { mode: string; scope_type: string }) => request({
+  startNewSession: (payload: { mode: string; scope_type: string; scope_config?: any }) => request({
     url: '/v1/inbound/stock/draft/start-new',
     method: 'post',
     params: withCompany(),
@@ -938,6 +1085,11 @@ const startNewSession = async () => {
     ElMessage.warning('请先选择公司')
     return
   }
+  // ★ 抽盘必须先在库位树上勾选范围，否则会开出一个空范围的会话
+  if (newScopeType.value === 'active' && !buildScopeConfig().locations.length) {
+    ElMessage.warning('抽盘至少要勾选一个库位')
+    return
+  }
   await doStartNewSession()
 }
 
@@ -947,10 +1099,13 @@ const doStartNewSession = async () => {
   try {
     // ★ 先清掉旧会话，避免签发失败时残留上一个 session_id
     clearPersistedSession()
-    // 后端签发新 session_id 并把盘点模式/范围落库到 stocktake_session，不删任何历史数据
+    // 后端签发新 session_id 并把盘点模式/范围落库到 stocktake_session，不删任何历史数据。
+    // ★ 抽盘范围由前端在库位树上勾选决定，后端不再自行计算
+    const scopeConfig = newScopeType.value === 'active' ? buildScopeConfig() : {}
     const res: any = await api.startNewSession({
       mode: newMode.value,
-      scope_type: newScopeType.value
+      scope_type: newScopeType.value,
+      scope_config: scopeConfig
     })
     persistSession(res?.session_id || res?.data?.session_id || '')
     await enterScanning('新盘点会话已开始')
@@ -1646,6 +1801,44 @@ const goToVarianceReview = () => {
   line-height: 1.5;
 }
 
+/* ★ 抽盘范围配置区（推荐 + 库位树勾选） */
+.scope-panel {
+  width: 100%;
+  border: 1px solid #ebeef5;
+  border-radius: 6px;
+  padding: 10px;
+  background: #fafafa;
+}
+.scope-recommend-row {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 6px;
+  margin-bottom: 8px;
+}
+.scope-recommend-text { font-size: 12px; color: #606266; }
+.scope-topn-input { width: 100px; }
+/* 平板大屏：定高 + 滚动，避免树把表单撑得过长 */
+.scope-tree {
+  max-height: 260px;
+  overflow-y: auto;
+  background: #fff;
+  border: 1px solid #ebeef5;
+  border-radius: 4px;
+  padding: 6px;
+  font-size: 14px;
+  --el-tree-node-content-height: 30px;
+}
+.scope-selected {
+  margin-top: 8px;
+  font-size: 12px;
+  color: #606266;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+.scope-selected strong { color: #409eff; font-size: 14px; }
+
 /* 场景 A 的进度提示与次要入口 */
 .active-session-tip {
   font-size: 12px;