Refactor serverless configuration to rename service, add Prisma layer support, and include AM_INVITATION_LINK in environment variables. Update validation schema and email invitation content for improved user experience.

layers/prisma/nodejs/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "prisma-layer",
+  "version": "1.0.0",
+  "description": "Lambda layer for Prisma 7 with pg driver adapter",
+  "dependencies": {
+    "@prisma/client": "^7.0.1",
+    "@prisma/adapter-pg": "^7.0.1",
+    "pg": "^8.13.0"
+  }
+}