feat: 新增门店选址分析功能

- 创建选址分析7个SQL视图+5张物化表（38s→33ms）
- 后端新增5个选址API端点
- 前端新增SiteSelectionPage页面（散点图+4Tab）
- 侧边栏新增门店选址导航入口
- 修复SQL列引用错误（d.→a.，去掉重复列）
- 创建v_store_action_priority_deep_april和v_store_area_efficiency_april基础视图

client/src/components/Layout.tsx

@@ -1,6 +1,6 @@
 import { ReactNode, useState } from 'react'
 import { Link, useLocation } from 'react-router-dom'
-import { LayoutDashboard, Store, ClipboardList, TrendingUp, Settings, LogOut, Menu, X, Package, DollarSign, ShoppingBag, Users, AlertTriangle, Clock, Database } from 'lucide-react'
+import { LayoutDashboard, Store, ClipboardList, TrendingUp, Settings, LogOut, Menu, X, Package, DollarSign, ShoppingBag, Users, AlertTriangle, Clock, Database, MapPin } from 'lucide-react'
 import { cn } from '@/lib/utils'
 
 interface LayoutProps {
@@ -41,6 +41,7 @@ const menuGroups: MenuGroup[] = [
       { path: '/member', label: '会员复购', icon: Users, roles: ['hq', 'dept'] },
       { path: '/risk', label: '风险内控', icon: AlertTriangle, roles: ['hq', 'dept'] },
       { path: '/time', label: '时间分析', icon: Clock, roles: ['hq', 'dept'] },
+      { path: '/site-selection', label: '门店选址', icon: MapPin, roles: ['hq', 'dept'] },
     ],
   },
   {