fix(felhom-wipe): detect sys_drive and other backups-only storage paths

Two bugs prevented /mnt/sys_drive (and similar drives) from being detected:

1. controller.yaml is root-owned (permission denied from host), so data_dir
   could not be read. Settings.json was never loaded, falling back to /mnt/*
   scan only. Fix: also try `docker volume inspect felhom-controller_controller-data`
   to locate the actual settings.json in the Docker volume.

2. Fallback /mnt/* scan only checked for felhom-data/ or appdata/, missing
   drives that only have backups/ (e.g. sys_drive pre-v0.26.0). Fix: also
   check for backups/ in the scan condition.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/felhom-wipe.sh

@@ -80,8 +80,8 @@ parse_args() {
 
 # --- Detect Paths ---
 detect_paths() {
-    # Auto-detect from controller.yaml if present
+    # Auto-detect from controller.yaml if readable (may be root-owned)
-    if [ -f "$CONTROLLER_YAML" ]; then
+    if [ -f "$CONTROLLER_YAML" ] && [ -r "$CONTROLLER_YAML" ]; then
         local sd
         sd=$(grep -oP 'stacks_dir:\s*\K\S+' "$CONTROLLER_YAML" 2>/dev/null || true)
         [ -n "$sd" ] && STACKS_DIR="$sd"
@@ -89,6 +89,18 @@ detect_paths() {
         dd=$(grep -oP 'data_dir:\s*\K\S+' "$CONTROLLER_YAML" 2>/dev/null || true)
         [ -n "$dd" ] && DATA_DIR="$dd" && SETTINGS_JSON="$dd/settings.json"
     fi
+
+    # If settings.json not found at configured path, try the Docker volume directly.
+    # The controller stores data in a named volume (felhom-controller_controller-data),
+    # not at the container-internal path on the host filesystem.
+    if [ ! -f "$SETTINGS_JSON" ]; then
+        local vol_path
+        vol_path=$(docker volume inspect felhom-controller_controller-data --format '{{.Mountpoint}}' 2>/dev/null || true)
+        if [ -n "$vol_path" ] && [ -d "$vol_path" ]; then
+            DATA_DIR="$vol_path"
+            SETTINGS_JSON="$vol_path/settings.json"
+        fi
+    fi
 }
 
 # --- Detect Storage Paths ---
@@ -109,9 +121,9 @@ except: pass
 " 2>/dev/null || true)
     fi
 
-    # Also scan /mnt/* for felhom-data dirs not in registry
+    # Also scan /mnt/* for felhom-managed dirs not in registry
     for d in /mnt/*/; do
-        [ -d "${d}felhom-data" ] || [ -d "${d}appdata" ] || continue
+        [ -d "${d}felhom-data" ] || [ -d "${d}appdata" ] || [ -d "${d}backups" ] || continue
         local already=false
         for sp in "${STORAGE_PATHS[@]:-}"; do
             [ "$sp" = "${d%/}" ] && already=true && break