Harden entrypoint NSS wrapper setup for Pterodactyl runtime

Improve uid/gid passwd mapping checks, broaden libnss-wrapper detection, and emit startup diagnostics so Avorion home-directory resolution issues are easier to verify in panel logs.

entrypoint.sh

@@ -2,8 +2,12 @@
 set -euo pipefail
 
 export USER=container
+export LOGNAME=container
 export HOME=/home/container
+export XDG_CONFIG_HOME=/home/container/.config
+export XDG_DATA_HOME=/home/container/.local/share
 mkdir -p /home/container /tmp
+mkdir -p "$XDG_CONFIG_HOME" "$XDG_DATA_HOME"
 
 uid="$(id -u)"
 gid="$(id -g)"
@@ -14,24 +18,33 @@ GROUP_FILE="/tmp/group"
 cp /etc/passwd "$PASSWD_FILE"
 cp /etc/group "$GROUP_FILE"
 
-if ! getent passwd "$uid" >/dev/null 2>&1; then
+if ! awk -F: -v target_uid="$uid" '$3 == target_uid { found=1 } END { exit !found }' "$PASSWD_FILE"; then
     echo "container:x:${uid}:${gid}::/home/container:/bin/bash" >> "$PASSWD_FILE"
 fi
 
-if ! getent group "$gid" >/dev/null 2>&1; then
+if ! awk -F: -v target_gid="$gid" '$3 == target_gid { found=1 } END { exit !found }' "$GROUP_FILE"; then
     echo "container:x:${gid}:" >> "$GROUP_FILE"
 fi
 
 export NSS_WRAPPER_PASSWD="$PASSWD_FILE"
 export NSS_WRAPPER_GROUP="$GROUP_FILE"
 
-libnss="$(find /usr/lib /lib -name 'libnss_wrapper.so' 2>/dev/null | head -n 1 || true)"
+libnss="$(find /usr/lib /lib -type f \( -name 'libnss_wrapper.so' -o -name 'libnss_wrapper.so.*' \) -print -quit 2>/dev/null || true)"
 if [ -n "$libnss" ]; then
     export LD_PRELOAD="${libnss}${LD_PRELOAD:+:${LD_PRELOAD}}"
+else
+    echo "[entrypoint] WARNING: libnss_wrapper not found; UID/GID passthrough may fail for Avorion." >&2
 fi
 
 cd /home/container
 
+echo "[entrypoint] uid=${uid} gid=${gid} home=${HOME} user=${USER}" >&2
+echo "[entrypoint] NSS wrapper passwd=${NSS_WRAPPER_PASSWD} group=${NSS_WRAPPER_GROUP}" >&2
+echo "[entrypoint] LD_PRELOAD=${LD_PRELOAD:-<empty>}" >&2
+if ! getent passwd "$uid" >/dev/null 2>&1; then
+    echo "[entrypoint] WARNING: getent cannot resolve uid ${uid} prior to exec." >&2
+fi
+
 if [ -n "${STARTUP:-}" ]; then
     echo ":/home/container$ ${STARTUP}"
     exec /bin/bash -c "${STARTUP}"