feat: scaffold installers/ for Console on-prem

installers/linux/README.md

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+# Linux Installer (Console — on-prem)
+
+Native Linux installer for Device Management Toolkit (Console) on-prem.
+
+**Status:** Not yet implemented.
+
+## Scope
+
+- `.deb`, `.rpm`, and shell-based options.
+- x86_64 and arm64.
+- systemd service integration.
+- Idempotent reinstall and clean uninstall.
+
+## Out of scope
+
+- Cloud (use `bicep/` or `charts/` with `values-cloud.yaml`).
+- Multi-host clustering (use `charts/` with `values-onprem.yaml`).

installers/macos/README.md

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+# macOS Installer (Console — on-prem)
+
+Native macOS installer for Device Management Toolkit (Console) on-prem.
+
+**Status:** Not yet implemented.
+
+## Scope
+
+- `.pkg` or shell-based installer that provisions Console + dependencies (postgres, vault) on a single macOS host.
+- Apple Silicon and Intel.
+- Idempotent reinstall and clean uninstall.
+
+## Out of scope
+
+- Cloud (use `bicep/` or `charts/` with `values-cloud.yaml`).
+- Multi-host clustering (use `charts/` with `values-onprem.yaml` on a k8s cluster).

installers/windows/README.md

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+# Windows Installer (Console — on-prem)
+
+Native Windows installer for Device Management Toolkit (Console) on-prem.
+
+**Status:** Not yet implemented.
+
+## Scope
+
+- `.msi` (WiX) primary, optional standalone `.exe`.
+- x86_64.
+- Windows Service registration.
+- Idempotent reinstall and clean uninstall.
+
+## Out of scope
+
+- Cloud (use `bicep/` or `charts/` with `values-cloud.yaml`).
+- Multi-host clustering (use `charts/` with `values-onprem.yaml`).