Pi bundle: drop the informational .env keys

KVITT_PI_HOST and KVITT_PI_SSH_USER were read by nothing on the Pi (D-103).
They are gone from .env.example; the README's scp, ssh and NPM steps use
<user>@<kvitt-pi-address> and the Kvitt Pi's LAN IPv4 address in words.
install.sh checks only the keys the stack reads, so an older .env that still
has the two keys installs unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

infra/pi/.env.example

@@ -1,5 +1,5 @@
 # Kvitt Pi settings (SPEC §10.2). Copy to .env in this folder, replace every CHANGE_ME, then run ./install.sh,
-# which copies it to /opt/kvitt/.env (mode 0600). install.sh refuses a .env that still contains CHANGE_ME.
+# which copies it to /opt/kvitt/.env (mode 0600). install.sh refuses a CHANGE_ME left in a key it checks.
 # No secret files here: those go to /opt/kvitt/secrets/ (infra/README.md "Pi: what the owner does").
 
 # --- Read by compose.yaml -----------------------------------------------------------------------------------------
@@ -30,10 +30,3 @@ RCLONE_FOLDER_ID=1jDp1dGE5R3H2DBcXCqIPN1iWzQnPkdlV
 KVITT_REGISTRY_USER=
 # Gitea access token of that user with read:package scope; leave empty for anonymous pull. Never commit a filled .env.
 KVITT_REGISTRY_TOKEN=
-
-# --- Informational: used in the owner's commands on the Mac (scp) and in NPM, read by nothing on the Pi ---------
-
-# LAN address of the Kvitt Pi itself (OQ-3); also NPM's Forward Hostname / IP (infra/README.md, NPM section).
-KVITT_PI_HOST=CHANGE_ME_KVITT_PI_HOST
-# SSH user on the Kvitt Pi (OQ-3).
-KVITT_PI_SSH_USER=CHANGE_ME_KVITT_PI_SSH_USER

infra/pi/compose.yaml

@@ -24,7 +24,7 @@ services:
     security_opt:
       - no-new-privileges:true
     mem_limit: 160m
-    # On all interfaces of the Pi: NPM on the Home Assistant Pi connects to <KVITT_PI_HOST>:8080 over the LAN.
+    # On all interfaces of the Pi: NPM on the Home Assistant Pi connects to this Pi's LAN address, port 8080.
     ports:
       - "8080:8080"
     environment: