fix: preserve server env files during local deploy

DEPLOYMENT.md

@@ -176,6 +176,12 @@ What it does:
 4. runs the remote deployment script
 5. verifies the health endpoint
 
+Important:
+- the helper preserves server-local env files:
+  - `.env.test`
+  - `.env.prod`
+- those files are not supposed to be replaced from your Mac checkout
+
 Default assumptions:
 - target host: `root@192.168.2.55`
 - target path: `/opt/workdock`