chore(deploy): expose flashcards on host port 4100 (4000 was taken)

compose.yaml

@@ -4,16 +4,17 @@ services:
   flashcard:
     image: 10.0.10.205:3000/bert.hausmans/flashcards:latest
     container_name: flashcard
+    # host:container — host 4000 was taken by another stack, so expose on 4100.
     ports:
-      - 4000:4000
+      - 4100:4000
     environment:
       - NODE_ENV=production
       - PORT=4000
       - DB_PATH=/app/data/flashcard.db
 
       # URL where users reach the app. Used in verification / reset / invite emails.
-      # CHANGE THIS to your real address, e.g. http://10.0.10.205:4000
-      - APP_URL=http://CHANGE-ME:4000
+      # CHANGE THIS to your real address, e.g. http://10.0.10.205:4100
+      - APP_URL=http://CHANGE-ME:4100
 
       # Keep "false" over plain HTTP (otherwise the browser drops the login
       # cookie). Set "true" only once behind an HTTPS reverse proxy.