fix: 修复成本/库存/对账多页面数据准确性与展示问题

- 库存周转: turnover_days零消耗时返回NULL并显示"无消耗",排序至末尾;
  门店名称三级回退(dim_store→mv_distribution_monthly→硬编码中央厨房)
- 成本管理: estimated_inventory_days为NULL时显示"-"而非"0.0天";
  补充成本率口径与指标关系说明
- 成本分析: 修复理论成本率计算(按单位售价而非单价),新增sales_quantity展示;
  区分菜品级(Excel)与门店级(倒挤)成本指标,说明差异原因
- 配送对账: 区分中央厨房/门店,分层展示耗用口径
- 告警/任务/目标管理: 新增详情弹窗组件,优化交互体验

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

client/src/pages/TargetManagementPage.tsx

@@ -8,13 +8,14 @@ import { Tabs } from '@/components/Tabs'
 import { formatCurrency, formatNumber, formatPercent } from '@/lib/utils'
 import { useState } from 'react'
 import { BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, Legend, ResponsiveContainer, PieChart, Pie, Cell } from 'recharts'
+import { MonthPicker } from '@/components/MonthPicker'
 
 const GRADE_COLORS: Record<string, string> = { A: '#22c55e', B: '#3b82f6', C: '#eab308', D: '#ef4444' }
 
 export function TargetManagementPage() {
   const [tab, setTab] = useState('overview')
-  const [year, setYear] = useState(new Date().getFullYear())
-  const [month, setMonth] = useState(new Date().toISOString().slice(0, 7))
+  const [month, setMonth] = useState('2026-04')
+  const year = parseInt(month.split('-')[0])
   const queryClient = useQueryClient()
 
   const { data: annualData, isLoading: annualLoading } = useQuery({
@@ -96,21 +97,7 @@ export function TargetManagementPage() {
           <h1 className="text-xl font-bold">目标管理</h1>
           <p className="mt-0.5 text-xs text-muted-foreground">年度战略目标 · 区域拆解 · 门店月度 · 达成率追踪</p>
         </div>
-        <div className="flex items-center gap-2">
-          <input
-            type="number"
-            value={year}
-            onChange={(e) => setYear(parseInt(e.target.value))}
-            className="w-20 rounded border px-2 py-1 text-sm"
-          />
-          <span className="text-sm text-muted-foreground">年</span>
-          <input
-            type="month"
-            value={month}
-            onChange={(e) => setMonth(e.target.value)}
-            className="rounded border px-2 py-1 text-sm"
-          />
-        </div>
+        <MonthPicker month={month} onChange={setMonth} />
       </div>
 
       <Tabs