refactor: remove demo timers and client-side timeout simulation

Remove lib/config/demo-timers.ts and all usages across stores
and pages. Order timeout scheduling, dispute auto-progression,
and hardcoded countdown displays are removed — timeouts are
now handled server-side by the backend.

app/(order)/order/[id]/page.tsx

@@ -6,7 +6,6 @@ import { EmptyState } from "@/components/ui/empty-state"
 import { Separator } from "@/components/ui/separator"
 import { StatusBadge } from "@/components/ui/status-badge"
 import { getOrderById, listChatSessions, listReviewsByOrder } from "@/lib/api"
-import { ORDER_ACCEPT_TIMEOUT_MS, ORDER_CLOSE_TIMEOUT_MS } from "@/lib/config/demo-timers"
 import { statusLabels } from "@/lib/constants"
 import type { OrderStatus } from "@/lib/types"
 import { ArrowLeft, CheckCircle, Clock, Star } from "lucide-react"
@@ -53,7 +52,6 @@ export default function OrderDetailPage({ params }: { params: Promise<{ id: stri
     undefined,
   )
   const [loading, setLoading] = useState(true)
-  const [nowTs, setNowTs] = useState(0)
 
   useEffect(() => {
     let cancelled = false
@@ -115,17 +113,6 @@ export default function OrderDetailPage({ params }: { params: Promise<{ id: stri
     }
   }, [id])
 
-  useEffect(() => {
-    if (!order) return
-    if (order.status !== "pending_accept" && order.status !== "pending_close") return
-
-    const timer = setInterval(() => {
-      setNowTs(Date.now())
-    }, 1000)
-
-    return () => clearInterval(timer)
-  }, [order])
-
   if (loading) {
     return (
       <div className="container mx-auto max-w-2xl px-4 py-8">
@@ -150,21 +137,6 @@ export default function OrderDetailPage({ params }: { params: Promise<{ id: stri
         ? cancelledStatusSteps
         : normalStatusSteps
   const currentStepIndex = statusSteps.indexOf(order.status)
-  const timeoutHint = (() => {
-    if (order.status !== "pending_accept" && order.status !== "pending_close") return null
-
-    const base =
-      order.status === "pending_accept"
-        ? new Date(order.createdAt).getTime()
-        : new Date(order.createdAt).getTime()
-    const timeoutMs =
-      order.status === "pending_accept" ? ORDER_ACCEPT_TIMEOUT_MS : ORDER_CLOSE_TIMEOUT_MS
-    const remainSeconds = Math.max(0, Math.ceil((timeoutMs - (nowTs - base)) / 1000))
-
-    return order.status === "pending_accept"
-      ? `若 ${Math.floor(ORDER_ACCEPT_TIMEOUT_MS / 1000)} 秒内无人接单，订单将自动取消（剩余 ${remainSeconds} 秒）`
-      : `若 ${Math.floor(ORDER_CLOSE_TIMEOUT_MS / 1000)} 秒内未确认，订单将自动进入待评价（剩余 ${remainSeconds} 秒）`
-  })()
 
   return (
     <div className="container mx-auto py-8 px-4 max-w-2xl">
@@ -212,12 +184,6 @@ export default function OrderDetailPage({ params }: { params: Promise<{ id: stri
         </CardContent>
       </Card>
 
-      {timeoutHint && (
-        <Card className="mb-6 border-border/80 shadow-sm">
-          <CardContent className="py-3 text-sm text-muted-foreground">{timeoutHint}</CardContent>
-        </Card>
-      )}
-
       <Card className="mb-6 border-border/80 shadow-sm">
         <CardHeader>
           <CardTitle className="text-base">服务信息</CardTitle>