refactor(monitoring): simplify monitoring scripts and remove state tracking

- Remove consecutive breach tracking for statement queue (immediate alerts)
- Consolidate script initialization into init_script() function
- Remove unused helper functions (send_ok, run_as_hana_user, get_mount_point)
- Flatten sld_watchdog.sh structure by removing main() wrapper
- Remove state directory and lock directory configuration from hana.conf
- Simplify alert messages to include threshold values

This continues the simplification effort from previous commits by removing stateful tracking mechanisms and streamlining the monitoring logic for easier maintenance.

hana.conf

@@ -33,7 +33,6 @@ DISK_USAGE_THRESHOLD=85
 TRUNCATED_PERCENTAGE_THRESHOLD=50
 FREE_PERCENTAGE_THRESHOLD=10
 STATEMENT_QUEUE_THRESHOLD=10
-STATEMENT_QUEUE_CONSECUTIVE_RUNS=3
 BACKUP_THRESHOLD_HOURS=32
 
 # --- Notification Configuration ---
@@ -45,10 +44,3 @@ COMPANY_NAME="My Company"
 LOG_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd)"
 LOG_FILE="${LOG_DIR}/hana_monitor.log"
 
-# --- State Directory ---
-STATE_DIR="${LOG_DIR}/monitor_state"
-mkdir -p "${STATE_DIR}"
-
-# --- Lock Directory ---
-LOCK_DIR="/tmp"
-