docs: .env.example platform-injected VERCEL/Lambda

Made-with: Cursor

Author: VoxHash

.env.example

@@ -23,6 +23,10 @@ LICENSECHAIN_APP_VERSION=1.0.0
 PORT=3005
 LOG_LEVEL=info
 
+# Platform-injected (do not set manually unless testing)
+# VERCEL=1
+# AWS_LAMBDA_FUNCTION_NAME=
+
 # -----------------------------------------------------------------------------
 # Admin (Telegram user IDs; get yours from @userinfobot)
 # -----------------------------------------------------------------------------