feat: add localhost web UI for scans, blocklist, and firewall management

.env.example

@@ -9,6 +9,14 @@
 # so production deployments can set these via the OS and skip `.env`.
 # `.env` is git-ignored — never commit real secrets to it.
 
+# --- Web server (localhost only) -------------------------------------------------
+
+# The Flask web UI binds to localhost so it is only reachable from this machine. 
+# Do not expose WEB_HOST beyond 127.0.0.1!
+WEB_HOST=127.0.0.1
+# Please choose a very high port number (e.g. 54666) to avoid conflicts with other services.
+WEB_PORT=54666
+
 # --- Log sources -----------------------------------------------------------
 
 # Directory containing copyparty access logs (YYYY-MM-DD.txt files).