chore: import upstream snapshot with attribution

apps/sim/app/api/mothership/chat/route.ts

@@ -0,0 +1,41 @@
+import { type NextRequest, NextResponse } from 'next/server'
+import {
+  mothershipChatGetQuerySchema,
+  mothershipChatPostEnvelopeSchema,
+} from '@/lib/api/contracts/mothership-chats'
+import { validationErrorResponse } from '@/lib/api/server'
+import { getSession } from '@/lib/auth'
+import { handleUnifiedChatPost, maxDuration } from '@/lib/copilot/chat/post'
+import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
+import { GET as copilotChatGet } from '@/app/api/copilot/chat/queries'
+
+export { maxDuration }
+
+// Unified chat route surface.
+export const GET = withRouteHandler((request: NextRequest) => {
+  const validation = mothershipChatGetQuerySchema.safeParse(
+    Object.fromEntries(request.nextUrl.searchParams.entries())
+  )
+  if (!validation.success) return validationErrorResponse(validation.error)
+
+  return copilotChatGet(request)
+})
+
+export const POST = withRouteHandler(async (request: NextRequest) => {
+  const session = await getSession()
+  if (!session?.user?.id) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  // boundary-raw-json: shim pre-validates the mothership envelope before delegating to the copilot handler that consumes the body
+  const body = await request
+    .clone()
+    .json()
+    .catch(() => undefined)
+  if (body !== undefined) {
+    const validation = mothershipChatPostEnvelopeSchema.safeParse(body)
+    if (!validation.success) return validationErrorResponse(validation.error)
+  }
+
+  return handleUnifiedChatPost(request)
+})