feat(chat): migrate chat to backend API

components/order-actions.tsx

@@ -12,7 +12,6 @@ import type { ApiDecision } from "@/lib/errors"
 import { notifyInfo, notifySuccess } from "@/lib/toast"
 import type { Order, OrderStatus } from "@/lib/types"
 import { useAuthStore } from "@/store/auth"
-import { useChatStore } from "@/store/chat"
 import { useOrderStore } from "@/store/orders"
 import { useShopStore } from "@/store/shops"
 import {
@@ -51,15 +50,12 @@ export default function OrderActions({
   const currentUserId = useAuthStore((state) => state.user?.id)
   const storeOrder = useOrderStore((state) => state.orders.find((item) => item.id === orderId))
   const order = orderProp ?? storeOrder
-  const sessions = useChatStore((state) => state.sessions)
   const dispatchMode = useShopStore((state) => {
     if (!order?.shopId) return "manual"
     const shop = state.shops.find((item) => item.id === order.shopId)
     return shop?.dispatchMode ?? "manual"
   })
-  const resolvedChatSessionId =
-    chatSessionId ??
-    sessions.find((session) => session.type === "order" && session.orderId === orderId)?.id
+  const resolvedChatSessionId = chatSessionId
 
   const status = order?.status ?? initialStatus
   const isConsumer = order?.consumerId === currentUserId