feat: set up announcement and cors logic for server

server/prisma/schema.prisma

@@ -0,0 +1,19 @@
+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "mongodb"
+  url      = env("MONGO_URI")
+}
+
+model Announcements {
+  id        String   @id @default(auto()) @map("_id") @db.ObjectId
+  title     String
+  content   String
+  type      String
+  createdAt DateTime @default(now()) @unique
+}