Oracle DR: Complete migration to PowerShell scripts and cleanup

Changes:
- Remove obsolete .cmd scripts (cleanup_database.cmd, rman_restore_from_zero.cmd, rman_restore_final.cmd)
- Update weekly-dr-test-proxmox.sh to call PowerShell scripts with /SILENT parameter
- Add initROA.ora configuration file for reference

All DR test scripts now use PowerShell for SSH compatibility
Resolves input redirection issues with Windows SSH

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

oracle/standby-server-scripts/initROA.ora

@@ -0,0 +1,34 @@
+# Initialization Parameters for ROA Database - DR VM
+# Generated: 2025-10-09 04:07:45
+
+# Database Identification
+db_name=ROA
+db_unique_name=ROA
+
+# Memory Configuration
+memory_target=1024M
+memory_max_target=1024M
+
+# File Locations
+control_files=('C:\Users\oracle\oradata\ROA\control01.ctl', 'C:\Users\oracle\recovery_area\ROA\control02.ctl')
+db_recovery_file_dest='C:\Users\oracle\recovery_area'
+db_recovery_file_dest_size=20G
+audit_file_dest='C:\Users\oracle\admin\ROA\adump'
+
+# Redo and Archive Log
+log_archive_format=%t_%s_%r.dbf
+
+# Compatibility
+compatible=19.0.0
+
+# Character Set
+nls_language=AMERICAN
+nls_territory=AMERICA
+
+# Processes and Sessions
+processes=300
+sessions=472
+
+# Miscellaneous
+diagnostic_dest='C:\Users\oracle'
+_allow_resetlogs_corruption=TRUE