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).

app/Helper.php

@@ -12,7 +12,7 @@ class Helper
     {
 
         $online_arrahn_connection = array_filter(config('database.connections'), function ($connection) {
-            if ($connection['database'] === 'online_arrahn') {
+            if ($connection['database'] === config('tennant_database.master_db')) {
                 return $connection;
             }
         });
@@ -43,7 +43,7 @@ class Helper
                 }
             });
 
-            $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);
@@ -74,7 +74,7 @@ class Helper
                 }
             });
 
-            $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_inactive_db_keys, function ($db_key) use ($non_cawangan_database) {
                 $isNotCawangan = in_array(config('database.connections.' . $db_key . '.database'), $non_cawangan_database);