docs: add Windows install guide

docs/install-windows.md

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+# Install on Windows
+
+This guide is for newcomers who want to install or run the Windows version of AhaKey.
+
+## Recommended: install from GitHub Releases
+
+1. Open the `AhakeyAI/desktop` **Releases** page.
+2. Download the latest Windows installer asset (`.exe` or `.msi`).
+3. Run the installer and follow the setup wizard.
+4. Launch AhaKey from the Start Menu after installation.
+
+> Note: this repository is source-only. Installer binaries are distributed via GitHub Releases, not committed in the repo.
+
+## For contributors: run Windows modules from source
+
+There is currently no single one-click Windows build entry. Build/run by module:
+
+### 1) desktop-main
+
+- Path: `platforms/windows/desktop-main/vibe_code_config_tool/`
+- Typical dev start:
+  - `pip install -r requirements.txt`
+  - `python main.py`
+
+### 2) ble-bridge
+
+- Path: `platforms/windows/ble-bridge/BLE_tcp_bridge_for_vibe_code/`
+- Typical build:
+  - Open `BLE_tcp_driver.sln` in Visual Studio and build
+  - Or build `BLE_tcp_driver.csproj` with .NET Framework 4.7.2 toolchain
+
+### 3) hook-installer
+
+- Path: `platforms/windows/hook-installer/vibe_code_hook/`
+- Common entry scripts:
+  - `python hook_install.py`
+  - `python install_hook.py`
+  - `python install_cursor_hook.py`
+
+### 4) speech
+
+- Path: `platforms/windows/speech/Capswriter/`
+- Typical dev start:
+  - `pip install -r requirements.txt`
+  - `python start_server.py`
+  - `python start_client.py`
+
+## Scope and expectations
+
+- This repo does **not** include release artifacts like `exe` / `msi`.
+- Historical packaging scripts (for example under `platforms/windows/scripts/inno-setup/`) are retained for migration reference and may not be directly reusable as current release pipelines.