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/(tabs)/opportunities.tsx

@@ -0,0 +1,11 @@
+import {Text,View} from "react-native"
+import {useQuery} from "@tanstack/react-query"
+import {useRouter} from "expo-router"
+import {useSession} from "../../src/state/session"
+import {Body,Button,EmptyState,ErrorMessage,Panel,Screen,Title,styles} from "../../src/components/ui"
+import type {Candidate} from "../../src/lib/candidates"
+export default function Opportunities(){
+ const {session,client}=useSession(),router=useRouter()
+ const query=useQuery({queryKey:["candidates",session?.user.id],enabled:!!session,queryFn:({signal})=>client<Candidate[]>("/api/v1/candidates",{signal}),refetchInterval:30000})
+ return <Screen><Title>机会</Title><Body>从证据、反证与失效条件理解一个候选。</Body><Panel accent><Body>模拟研究候选 · 由管理端手工录入并审核发布，当前未接入自动行情筛选。</Body></Panel><Button secondary title="查看自动同步的 A 股行情" onPress={()=>router.push("/market")}/><Button secondary title={query.isFetching?"刷新中…":"刷新候选"} disabled={query.isFetching} onPress={()=>void query.refetch()}/>{query.isPending&&<Body>正在读取已发布候选…</Body>}{query.error&&<ErrorMessage message={query.error.message}/>} {query.data?.length===0&&<EmptyState title="当前没有有效候选" detail="审核发布且未过期的模拟候选会显示在这里。"/>}{query.data?.map(c=><Panel key={c.id}><View style={styles.row}><Text style={styles.subtitle}>{c.content.name}</Text><Text style={styles.badge}>模拟候选</Text></View><Body>{c.content.exchange}:{c.content.symbol} · 修订 {c.revision}</Body><Text style={styles.subtitle}>{c.content.title}</Text><Body>{c.content.thesis}</Body><Body>有效截止 {new Date(c.valid_until).toLocaleString("zh-CN")}</Body><Button title="查看证据与风险" onPress={()=>router.push({pathname:"/candidates/[id]",params:{id:c.id}})}/></Panel>)}</Screen>
+}