enable dev|prod envs with simpler env vars system

.env.example

@@ -1,13 +1,16 @@
-SERVER_IP=0.0.0.0
-PROXY_PORT=3456
-FRONTEND_PORT=2080
-PB_PORT=8090
+# Runtime env for the SvelteKit + Hono app.
+#
+# The app's own loopback URLs are constants in code (PROXY_URL / PB_ENDPOINT);
+# ports live in config.ts for the proxy. Only these are real env vars:
+
+# PB superuser (server-side only). Defaults in code: debug@famchamp.dev / debug123.
 PB_EMAIL=
 PB_PASSWORD=
-DEBUG_RECORD_ID=
-PUBLIC_PB_URL=
+# Public: the dev machine's IP where PB + the dev proxy run. Change this when
+# your remote IP changes — the browser (pocketbase.ts) and pb-admin read it.
+# Prod ignores this (uses /pb via nginx). Default: 192.168.1.225.
+SERVER_IP=192.168.1.225
 
-# docker-compose (staging)
-PORT=3001
-PB_DATA=./pb_data
-PB_ENDPOINT=http://127.0.0.1:8090
+# docker-compose (staging) — host-side deploy config, never baked into the image.
+PORT=3001        # public port to publish (nginx container listens on 3001)
+PB_DATA=./pb_data # where to persist PocketBase data on the host