Add debug logging for Ceph OSD detection

Added log_info messages to show:
- Count of OSDs found
- Each device-to-OSD mapping as discovered

Also fixed array subscript quoting in CEPH_DEVICE_TO_OSD.

Run with --verbose to see Ceph detection diagnostics.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

driveAtlas.sh

@@ -665,6 +665,7 @@ build_ceph_cache() {
     # Parse ceph-volume lvm list output
     # Format: blocks starting with "====== osd.X =======" followed by device info
     local current_osd=""
+    local osd_count=0
     while IFS= read -r line; do
         # Match OSD header: "====== osd.5 ======="
         if [[ "$line" =~ ======[[:space:]]+osd\.([0-9]+)[[:space:]]+======= ]]; then
@@ -672,9 +673,12 @@ build_ceph_cache() {
         # Match block device line: "      block device              /dev/sda"
         elif [[ -n "$current_osd" && "$line" =~ block[[:space:]]device[[:space:]]+/dev/([^[:space:]]+) ]]; then
             local dev_name="${BASH_REMATCH[1]}"
-            CEPH_DEVICE_TO_OSD[$dev_name]="$current_osd"
+            CEPH_DEVICE_TO_OSD["$dev_name"]="$current_osd"
+            ((osd_count++))
+            log_info "Found $current_osd on $dev_name"
         fi
     done < <(ceph-volume lvm list 2>/dev/null)
+    log_info "Cached $osd_count Ceph OSDs"
 
     # Skip if ceph command is not available
     if ! command -v ceph &>/dev/null; then