Refactor tenant database configuration to use dynamic config values

- Replace hardcoded database names (online_arrahn, master_krk, kaunterpkb)
  with configurable values across the codebase
- Rename tennant_master.php to tennant_database.php for clearer naming
- Update config keys: 'database' → 'master_db', add 'kaunter_db'
- Update env variables: TENNANT_MASTER_DB and TENNANT_KAUNTER_DB
- Modify Helper.php to use dynamic database references in
  getOnlineArrahnConnection(), getActiveCawanganDbConnection(),
  and getInactiveCawanganDbConnection() methods
- Update database JOIN queries in CustomerController and MarhunController
  to use config values instead of hardcoded database names
- Simplify migration logic by removing redundant hardcoded database checks
- Update debug messages in CawanganDebugConnections to show actual
  configured database name
- Update bootstrap/app.php to load tennant_database config

This change improves multi-environment flexibility and eliminates
environment-specific hardcoded values, making the application more
configurable for different deployment scenarios (KRK, KGMK, etc).

tinker/getActiveCawanganDbConnection.php

@@ -11,7 +11,7 @@ $all_active_db_keys = array_filter(array_keys(config('database.connections')), f
     }
 });
 
-$non_cawangan_database = ['lelong', 'online_arrahn', 'kaunterpkb'];
+$non_cawangan_database = ['lelong', config('tennant_database.master_db'), config('tennant_database.kaunter_db')];
 
 $all_cawangan_db = array_filter($all_active_db_keys, function($db_key) use($non_cawangan_database){
     $isNotCawangan = in_array(config('database.connections.' . $db_key . '.database'), $non_cawangan_database);