fix: guard addon config symlink creation

The migration code was checking `/homeassistant/addons_config/filebrowser_quantum/`
but the actual HA addon config path is `/homeassistant/addon_configs/db21ed7f_filebrowser_quantum/`.

Changes:
- Add migration check for the correct addon_configs path with slug prefix
- Handle the standard `addon_configs` directory for symlink operations
- Keep legacy `addons_config` path support for backward compatibility

Fixes: Configuration doesn't survive over restarts

filebrowser_quantum/rootfs/etc/cont-init.d/20-folders.sh

@@ -7,11 +7,23 @@ set -e
 ####################
 
 if [ -f /homeassistant/addons_config/filebrowser_quantum/filebrowser_quantum.db ]; then
-    echo "Moving database to new location /config"
+    echo "Moving database from legacy addons_config location to /config"
     cp -rnf /homeassistant/addons_config/filebrowser_quantum/* /config/
     rm -r /homeassistant/addons_config/filebrowser_quantum
 fi
 
+if [ ! -f /config/filebrowser_quantum.db ] && [ -d /addon_configs ]; then
+    shopt -s nullglob
+    for addon_config_dir in /addon_configs/*_filebrowser_quantum; do
+        if [ -f "$addon_config_dir/filebrowser_quantum.db" ]; then
+            echo "Moving database from addon_configs location to /config"
+            cp -rnf "$addon_config_dir"/. /config/
+            break
+        fi
+    done
+    shopt -u nullglob
+fi
+
 ######################
 # Link addon folders #
 ######################
@@ -21,21 +33,30 @@ find /config -maxdepth 1 -type l -delete
 if [ -d /homeassistant/addons_config ]; then
     find /homeassistant/addons_config -maxdepth 1 -type l -delete
 fi
-
 # Remove erroneous folders
 if [ -d /homeassistant ]; then
     if [ -d /config/addons_config ]; then
         rm -r /config/addons_config
     fi
+    if [ -d /config/addon_configs ]; then
+        rm -r /config/addon_configs
+    fi
     if [ -d /config/addons_autoscripts ]; then
         rm -r /config/addons_autoscripts
     fi
 fi
 
 # Create symlinks with legacy folders
+addon_configs_symlink_dir=""
 if [ -d /homeassistant/addons_config ]; then
     ln -s /homeassistant/addons_config /config
-    find /addon_configs/ -maxdepth 1 -mindepth 1 -type d -not -name "*filebrowser_quantum*" -exec ln -s {} /config/addons_config/ \;
+    addon_configs_symlink_dir="/config/addons_config"
+elif [ -d /addon_configs ]; then
+    mkdir -p /config/addon_configs
+    addon_configs_symlink_dir="/config/addon_configs"
+fi
+if [ -n "$addon_configs_symlink_dir" ] && [ -d /addon_configs ]; then
+    find /addon_configs/ -maxdepth 1 -mindepth 1 -type d -not -name "*filebrowser_quantum*" -exec ln -s {} "$addon_configs_symlink_dir"/ \;
 fi
 if [ -d /homeassistant/addons_autoscripts ]; then
     ln -s /homeassistant/addons_autoscripts /config