refactor(cleanup): generalize cleanup beyond logs

Rename configuration variables and functions to reflect broader
functionality beyond just log files. Updates include renaming
LOG_DIRS_FOR_CLEANUP to DIRS_FOR_AUTODELETE and
clean_log_files to clean_directory_files. Adds safety warnings
to prevent deletion of critical HANA system logs.

BREAKING CHANGE: Config keys renamed from LOG_DIRS_FOR_CLEANUP to
DIRS_FOR_AUTODELETE and MAX_LOG_FILE_AGE_DAYS to MAX_FILE_AGE_DAYS

hana.conf

@@ -28,22 +28,25 @@ DIRECTORIES_TO_MONITOR=(
     "/usr/sap"
 )
 
-# --- Log Directories for Auto-Cleanup ---
+# --- Directories for Auto-Delete ---
 # These directories will be automatically cleaned when disk space is low
-# Format: "mount_point:log_directory_path"
+# Format: "mount_point:directory_path"
 # The script will check if a monitored directory is on the same mount point
-# as a log directory and can clean the log directory to free up space
-LOG_DIRS_FOR_CLEANUP=(
-    "/hana/log:/hana/log"
+# as an auto-delete directory and can clean it to free up space
+# NOTE: Do NOT include HANA system logs like /hana/log - only include
+# directories with safe-to-delete files like backup logs, temp files, etc.
+DIRS_FOR_AUTODELETE=(
+    "/hana/log:/hana/log/backups"
+    "/hana/data:/hana/data/temp"
     "/usr/sap:/usr/sap/trans/log"
     "/usr/sap:/usr/sap/hostctrl/work/log"
 )
 
-# --- Disk Cleanup Configuration ---
+# --- Disk Auto-Delete Configuration ---
 # Minimum free space percentage to maintain after cleanup
 MIN_FREE_SPACE_AFTER_CLEANUP=5
-# Maximum age of log files to delete (in days)
-MAX_LOG_FILE_AGE_DAYS=7
+# Maximum age of files to delete (in days)
+MAX_FILE_AGE_DAYS=7
 # Enable automatic cleanup when disk usage exceeds threshold
 AUTO_CLEANUP_ENABLED=true