Add demo trading page, trader snapshot service and trading tables

Add trading_symbols, trading_analyses, trading_orders and trading_events.
The new trader service publishes account, position and open-order
snapshots of the Binance demo account to Redis every 3s. The /trading
page shows engine status, start/stop, balances, positions, the symbol
list with angle selection, open orders and the event timeline.

web/src/apis/trading.ts

@@ -0,0 +1,138 @@
+import type { Effort } from "@/apis/settings"
+import { http } from "@/http"
+
+export type Angle = "short" | "long"
+
+export const ANGLE_LABELS: Record<Angle, string> = { short: "短线（24h 内平仓）", long: "长线（12–48h 平仓）" }
+
+/** 以下数值字段都是币安返回的十进制字符串，避免浮点误差 */
+export interface SnapshotPosition {
+  symbol: string
+  side: "LONG" | "SHORT"
+  amount: string
+  entry_price: string
+  break_even_price: string
+  mark_price: string
+  unrealized_pnl: string
+  liquidation_price: string
+  notional: string
+  margin: string
+  leverage: number
+  margin_type: string
+}
+
+export interface SnapshotOrder {
+  symbol: string
+  client_id: string
+  side: "BUY" | "SELL"
+  type: string
+  price: string
+  quantity: string
+  filled: string
+  reduce_only: boolean
+  time: number
+}
+
+export interface SnapshotAlgoOrder {
+  symbol: string
+  client_id: string
+  side: "BUY" | "SELL"
+  type: string
+  trigger_price: string
+  quantity: string
+  close_position: boolean
+  reduce_only: boolean
+  time: number
+}
+
+export interface Snapshot {
+  updated_at: string
+  /** 最近一次成功同步币安的时间 */
+  synced_at: string | null
+  error: string | null
+  account: { wallet_balance: string, margin_balance: string, available_balance: string, unrealized_pnl: string } | null
+  positions: SnapshotPosition[]
+  orders: SnapshotOrder[]
+  algo_orders: SnapshotAlgoOrder[]
+}
+
+export interface TradingStatus {
+  configured: boolean
+  running: boolean
+  running_changed_at: string | null
+  provider_id: number | null
+  reasoning_effort: Effort | null
+  /** trader 进程离线时为空 */
+  snapshot: Snapshot | null
+  today: { analyses: number, limit: number, input_tokens: number, output_tokens: number }
+}
+
+export interface TradingSymbol {
+  symbol: string
+  angle: Angle
+  added_at: string
+  analysis_requested_at: string | null
+  analyzing: boolean
+  plan_status: "pending" | "open" | null
+}
+
+export interface SymbolOption {
+  symbol: string
+  base: string
+}
+
+export interface TradingEvent {
+  id: number
+  created_at: string
+  symbol: string | null
+  analysis_id: number | null
+  kind: string
+  level: "info" | "warn" | "error"
+  message: string
+  data: Record<string, unknown> | null
+}
+
+/** 本程序下的单；其他是用户手动下的 */
+export function isOwnOrder(clientId: string) {
+  return /^ap\d+$/.test(clientId)
+}
+
+export function getStatus(): Promise<TradingStatus> {
+  return http.get("/trading/status")
+}
+
+export function startTrading(): Promise<TradingStatus> {
+  return http.post("/trading/start")
+}
+
+export function stopTrading(): Promise<TradingStatus> {
+  return http.post("/trading/stop")
+}
+
+export function patchConfig(body: { provider_id?: number | null, reasoning_effort?: Effort | null }): Promise<TradingStatus> {
+  return http.patch("/trading/config", body)
+}
+
+export function listSymbolOptions(): Promise<SymbolOption[]> {
+  return http.get("/trading/symbol-options")
+}
+
+export function listSymbols(): Promise<TradingSymbol[]> {
+  return http.get("/trading/symbols")
+}
+
+export function addSymbol(symbol: string, angle: Angle): Promise<void> {
+  return http.post("/trading/symbols", { symbol, angle })
+}
+
+export function patchSymbol(symbol: string, angle: Angle): Promise<void> {
+  return http.patch(`/trading/symbols/${symbol}`, { angle })
+}
+
+export function deleteSymbol(symbol: string): Promise<void> {
+  return http.delete(`/trading/symbols/${symbol}`)
+}
+
+export function listEvents(params: { symbol?: string, before?: number, limit?: number }): Promise<TradingEvent[]> {
+  return http.get("/trading/events", { params })
+}