Add Inno Setup Windows installer scaffold

windows/installer/README-INSTALLER.md

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+# AWatch-rus Inno Setup installer skeleton
+
+This directory contains a ready-to-build scaffold for a classic Setup.exe installer.
+
+## Files
+- `AWatch-rus-Setup.iss` — Inno Setup script.
+- `Invoke-AWatchRusInstall.ps1` — wrapper that invokes `deploy-ensemble.ps1` with installer parameters.
+
+## Build
+1. Install Inno Setup 6 on Windows build host.
+2. Open `AWatch-rus-Setup.iss` in Inno Setup Compiler.
+3. Build to produce `output/AWatch-rus-Setup.exe`.
+
+## Behavior
+- Requires Administrator privileges.
+- Copies toolkit scripts into `{app}\tools`.
+- Collects server/domain/users parameters via wizard page.
+- Runs `Invoke-AWatchRusInstall.ps1` -> `deploy-ensemble.ps1`.
+- Runs validation at the end.
+- Uninstall step removes `ActivityWatch` scheduled tasks.
+
+## Notes
+- Default publisher URL is a placeholder (`https://example.local/awatch-rus`), replace it.
+- For silent enterprise rollout, extend `[Run]` and parse `/SERVERHOST=...` style custom switches if needed.