feat(chat): migrate chat to backend API

app/(order)/orders/page.tsx

@@ -4,7 +4,7 @@ import { Badge } from "@/components/ui/badge"
 import { Button } from "@/components/ui/button"
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
-import { listOrders } from "@/lib/api"
+import { listChatSessions, listOrders } from "@/lib/api"
 import { statusLabels } from "@/lib/constants"
 import {
   isActiveOrder,
@@ -16,7 +16,6 @@ import { resolveOwnerShop } from "@/lib/domain/resolve-current-shop"
 import type { OrderStatus, UserRole } from "@/lib/types"
 import { cn } from "@/lib/utils"
 import { useAuthStore } from "@/store/auth"
-import { useChatStore } from "@/store/chat"
 import { useShopStore } from "@/store/shops"
 import { Clock, MessageSquare, RefreshCw } from "lucide-react"
 import Link from "next/link"
@@ -83,7 +82,7 @@ function OrderListContent({
 }) {
   const [tab, setTab] = useState<TabFilter | "pending">("all")
   const [orders, setOrders] = useState<Awaited<ReturnType<typeof listOrders>>>([])
-  const sessions = useChatStore((state) => state.sessions)
+  const [sessions, setSessions] = useState<Awaited<ReturnType<typeof listChatSessions>>>([])
 
   useEffect(() => {
     let cancelled = false
@@ -104,6 +103,25 @@ function OrderListContent({
     }
   }, [])
 
+  useEffect(() => {
+    let cancelled = false
+
+    ;(async () => {
+      try {
+        const items = await Promise.resolve(listChatSessions())
+        if (cancelled) return
+        setSessions(items)
+      } catch {
+        if (cancelled) return
+        setSessions([])
+      }
+    })()
+
+    return () => {
+      cancelled = true
+    }
+  }, [])
+
   const tabs =
     currentRole === "consumer" ? consumerTabs : currentRole === "player" ? playerTabs : ownerTabs