feat(live): B4前端三层展示+预算表单+账户实况端点(spec§B4)——①新建实盘表单:起始资金升级『实例预算』,默认值=剩余可分配(budget-info,用户改过不跟随),占用率进度条(已分配+本次 vs 现金),超限红条+禁提交,快照不可用警告条(与后端fail-closed双保险)②监控页三层重构:本策略买卖(live_trades归因,今日/全部)/本策略账本+持仓(实例视图,现金/市值/净值语义重命名)/账户实况(新卡:现金/市值/总资产+Σ实例市值+未归因市值=账户市值−Σ实例+实例分解表+QMT全账户持仓表)③列表页:每QMT账号一条占用率横幅,存量超限亮黄条⚠④后端补GET /live/account-snapshot(注册在{aid}前):全局快照+同账号实例最新账本分解+unattributed_mv,快照缺失fresh=False数值None;⑤live.ts补BudgetInfo/AccountSnapshotView类型+updateLive带initial_capital;+3端点测试(分解算术/无快照降级/跨账号过滤);api 164绿;npm run build绿 [vps]

frontend/src/api/live.ts

@@ -149,7 +149,78 @@ export interface LiveUpdateReq {
   interval?: string
 }
 
+export interface LiveUpdateReq {
+  name?: string
+  account?: string
+  vt_symbol?: string
+  strategy_name?: string
+  interval?: string
+  /** B3 预算(initial_capital 含义升级为资金额度) */
+  initial_capital?: number
+}
+
 export async function updateLive(aid: number, req: LiveUpdateReq): Promise<{ updated: boolean }> {
   const { data } = await apiClient.put(`/live/${aid}`, req)
   return data
 }
+
+// ===== B3/B4 预算制 + 账户实况 =====
+
+/** B3 预算信息(GET /live/budget-info) */
+export interface BudgetInfo {
+  account: string
+  /** 快照是否新鲜(10 分钟内);false 时 remaining=null(fail-closed) */
+  fresh: boolean
+  account_cash: number | null
+  allocated: number
+  remaining: number | null
+  snapshot_at?: string | null
+}
+
+export async function getBudgetInfo(account: string): Promise<BudgetInfo> {
+  const { data } = await apiClient.get<BudgetInfo>('/live/budget-info', {
+    params: { account },
+  })
+  return data
+}
+
+/** B4 账户实况持仓行(qmt_account_snapshot.positions JSON) */
+export interface AccountPositionRow {
+  symbol: string
+  volume: number
+  can_use: number
+  avg_price: number
+  mv: number
+}
+
+/** B4 账户实况实例分解行 */
+export interface SnapshotInstanceRow {
+  id: number
+  name: string
+  status: string
+  initial_capital: number
+  cash: number | null
+  market_value: number | null
+  equity: number | null
+}
+
+/** B4 账户实况(GET /live/account-snapshot) */
+export interface AccountSnapshotView {
+  account: string
+  fresh: boolean
+  cash: number | null
+  market_value: number | null
+  total: number | null
+  positions: AccountPositionRow[]
+  updated_at?: string | null
+  instances: SnapshotInstanceRow[]
+  instance_mv_total: number
+  unattributed_mv: number | null
+}
+
+export async function getAccountSnapshot(account: string): Promise<AccountSnapshotView> {
+  const { data } = await apiClient.get<AccountSnapshotView>('/live/account-snapshot', {
+    params: { account },
+  })
+  return data
+}