feat(audit): address batch 4 and finalize script audit

- Implement nomarchy-skill, nomarchy-manual, nomarchy-backup, nomarchy-install
- Implement nomarchy-install-docker-dbs (stub)
- Port nomarchy-docs-keybindings and nomarchy-docs-scripts to packaged scripts
- Add installerVm to flake.nix nixosConfigurations, packages, and apps
- Update nomarchy-test-installer to use nix run .#installerVm
- Add docker support to virtualization.nix and options.nix
- Add glow to script dependencies
- Finalize docs/SCRIPTS.md update

flake.nix

@@ -120,6 +120,25 @@
         ];
       };
 
+      # Installer VM for testing
+      installerVm = nixpkgs.lib.nixosSystem {
+        specialArgs = { inherit inputs; };
+        modules = [
+          {
+            nixpkgs.hostPlatform = "x86_64-linux";
+            nixpkgs.overlays = overlays;
+          }
+          "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix"
+          ./hosts/installer-iso.nix
+          {
+            system.stateVersion = "25.11";
+            networking.hostName = "nomarchy-installer-vm";
+            virtualisation.vmVariant.virtualisation.memorySize = 4096;
+            virtualisation.vmVariant.virtualisation.cores = 2;
+          }
+        ];
+      };
+
       # Graphical installer ISO (legacy, for users who prefer GUI)
       installerIsoGraphical = nixpkgs.lib.nixosSystem {
         specialArgs = { inherit inputs; };
@@ -208,6 +227,16 @@
       #     nix build /etc/nomarchy#allThemeVariants --no-link
       inherit allThemeVariants;
       default = allThemeVariants;
+
+      # Expose installer VM as a package
+      installerVm = self.nixosConfigurations.installerVm.config.system.build.vm;
+    };
+
+    apps.${system} = {
+      installerVm = {
+        type = "app";
+        program = "${self.packages.${system} .installerVm}/bin/run-nomarchy-installer-vm";
+      };
     };
   };
 }