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/Console/Commands/CawanganDebugConnections.php

@@ -80,7 +80,7 @@ class CawanganDebugConnections extends Command
                 return $idToNameMap[$item['mysql']] !== $item['database'];
             });
            } catch (\Throwable $th) {
-                dump(sprintf('Connection %s not found in table online_arrahn.arrahn_master_db but present in config. Make sure both of connection exist in both app/config and arrahn_master_db', $tested_connection));
+                dump(sprintf('Connection %s not found in table %s.arrahn_master_db but present in config. Make sure both of connection exist in both app/config and arrahn_master_db', $tested_connection, config('tennant_database.master_db')));
                 return;
            }