Update application code and dependencies

app/api/conversations/[id]/messages/route.ts

@@ -0,0 +1,30 @@
+import { prisma } from "@/app/lib/prisma"
+import { NextResponse } from "next/server"
+
+export async function POST(
+  request: Request,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const { id } = await params
+  const body = await request.json()
+  const { role, content } = body
+
+  if (!role || !content) {
+    return NextResponse.json({ error: "role and content are required" }, { status: 400 })
+  }
+
+  const message = await prisma.message.create({
+    data: {
+      conversationId: parseInt(id),
+      role,
+      content,
+    },
+  })
+
+  await prisma.conversation.update({
+    where: { id: parseInt(id) },
+    data: { updatedAt: new Date() },
+  })
+
+  return NextResponse.json(message)
+}