first commit

Program.cs

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+using HanaToolbox.Cli;
+using HanaToolbox.Commands;
+
+var cli = CliArgs.Parse(args);
+
+return cli.Command switch
+{
+    "backup"        => await BackupCommand.RunAsync(cli),
+    "export"        => await ExportCommand.RunAsync(cli),
+    "import"        => await ImportCommand.RunAsync(cli),
+    "import-rename" => await ImportRenameCommand.RunAsync(cli),
+    "aurora"        => await AuroraCommand.RunAsync(cli),
+    "clean"         => await CleanCommand.RunAsync(cli),
+    "monitor"       => await MonitorCommand.RunAsync(cli),
+    "firewall"      => await FirewallCommand.RunAsync(cli),
+    "keymanager"    => await KeyManagerCommand.RunAsync(cli),
+    "cron"          => await CronCommand.RunAsync(cli),
+    "onboard"       => await OnboardCommand.RunAsync(cli),
+    ""              => Help(),
+    _               => UnknownCommand(cli.Command),
+};
+
+static int Help()
+{
+    Console.WriteLine("""
+        HanaToolbox — SAP HANA & Business One management toolkit
+
+        Usage: hanatoolbox <command> [options]
+
+        Commands:
+          backup           Run a HANA tenant/schema backup manually
+          export           Export a schema: export <schema> <path> [-c] [-t N]
+          import           Import a schema: import <schema> <path> [-c] [-t N] [--replace]
+          import-rename    Import & rename:  import-rename <src> <dst> <path> [-c] [-t N] [--replace]
+          aurora           Run an Aurora schema refresh manually
+          clean            Delete old backup/log files per retention policy
+          monitor          Run a HANA monitoring check manually
+          firewall         Open the interactive Firewall TUI
+          keymanager       Open the interactive Key Manager TUI
+          cron             Run scheduled tasks (called by system cron every minute)
+          cron setup       Configure cron task schedules and settings (TUI)
+          onboard          Run the initial setup wizard
+
+        Global options:
+          -v, --verbose    Enable verbose output
+          --sid <SID>      Override HANA SID from config (default: from hanatoolbox.json)
+        """);
+    return 0;
+}
+
+static int UnknownCommand(string cmd)
+{
+    Console.Error.WriteLine($"hanatoolbox: unknown command '{cmd}'");
+    Console.Error.WriteLine("Run 'hanatoolbox' for usage.");
+    return 1;
+}