feat: 完成模拟交易闭环、App 与 A 股行情接入

统一单入口 Go 工程与前端依赖目录，增加后台供应商配置、候选审核、计划预算、成交冲正、持仓复盘和站内通知。接入策略版本、Python 回测、可配置 A 股公开行情及 zap 文件轮转日志，补充迁移、契约与验证。

apps/mobile/app/_layout.tsx

@@ -0,0 +1,15 @@
+import {Stack} from "expo-router"
+import {StatusBar} from "expo-status-bar"
+import {SafeAreaProvider} from "react-native-safe-area-context"
+import {SessionProvider,useSession} from "../src/state/session"
+import {Body,Button,ErrorMessage,Screen,Title,colors} from "../src/components/ui"
+function Routes(){
+ const {session,loading,restoreError,retry}=useSession()
+ if(loading)return <Screen><Title>见势 · Veyra</Title><Body>正在恢复会话…</Body></Screen>
+ if(restoreError)return <Screen><Title>连接暂时中断</Title><ErrorMessage message={restoreError}/><Button title="重新连接" onPress={retry}/></Screen>
+ return <Stack screenOptions={{headerStyle:{backgroundColor:colors.background},headerTintColor:colors.text,headerShadowVisible:false,contentStyle:{backgroundColor:colors.background}}}>
+  <Stack.Protected guard={!session}><Stack.Screen name="login" options={{headerShown:false}}/></Stack.Protected>
+  <Stack.Protected guard={!!session}><Stack.Screen name="(tabs)" options={{headerShown:false}}/><Stack.Screen name="settings/accounts" options={{title:"账户管理"}}/><Stack.Screen name="fills/create" options={{title:"成交录入"}}/><Stack.Screen name="plans/create" options={{title:"计划预算"}}/><Stack.Screen name="candidates/[id]" options={{title:"候选证据"}}/><Stack.Screen name="notifications" options={{title:"提醒中心"}}/></Stack.Protected>
+ </Stack>
+}
+export default function RootLayout(){return <SafeAreaProvider><SessionProvider><StatusBar style="dark"/><Routes/></SessionProvider></SafeAreaProvider>}