chore: add GUI quickstart docs and update README for 0.1.0-beta.0

docs/gui-quickstart-windows.md

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+# Konduit GUI — Windows Quickstart
+
+## Requirements
+
+- Windows 10 or later (64-bit)
+- Administrator account (required for VPN driver installation)
+
+## 1. Download
+
+Download `konduit-gui-*-windows-x86_64.zip` from the [Releases](../../releases) page.
+
+## 2. Extract
+
+Right-click the zip file and choose **Extract All**. Extract to a folder of your choice, for example `C:\Konduit`.
+
+Keep all files together — `Konduit.exe` and `wintun.dll` must be in the same folder.
+
+## 3. Run
+
+Double-click `Konduit.exe`.
+
+Windows will show a **UAC prompt** asking for administrator permission. This is required because Konduit uses the [WinTun](https://www.wintun.net/) driver to create a virtual network adapter. Click **Yes** to continue.
+
+> If you dismiss the UAC prompt, Konduit will not be able to establish a VPN connection.
+
+## 4. Load your config
+
+Your server administrator will provide a `client.toml` config file. On first launch, tap **Open config** and select the file.
+
+## 5. Connect
+
+Press **Connect**. A system tray icon will appear while the VPN is active. Right-click the tray icon to disconnect.
+
+## 6. Windows Defender / antivirus warning
+
+Some antivirus tools flag `wintun.dll` or new unsigned executables. If Windows Defender blocks the launch:
+
+1. Open **Windows Security → Virus & threat protection**
+2. Click **Protection history**
+3. Find the Konduit entry and choose **Allow**
+
+Alternatively, add the Konduit folder to your antivirus exclusion list.
+
+## 7. Autostart on login (optional)
+
+To start Konduit automatically when Windows starts, enable it in the app: **Settings → Start on login**.
+
+Alternatively, create a shortcut to `Konduit.exe` and place it in your Startup folder:
+
+```
+Win + R → shell:startup → paste shortcut here
+```
+
+## Troubleshooting
+
+**UAC prompt does not appear / app closes immediately** — make sure you are running as a user with administrator privileges. Standard (non-admin) accounts cannot install the WinTun driver.
+
+**"wintun.dll not found"** — `Konduit.exe` and `wintun.dll` must be in the same folder. Do not move them separately.
+
+**Connection fails immediately** — check that your `client.toml` points to the correct server address and port. Contact your server administrator if you are unsure.
+
+**Tray icon disappears unexpectedly** — the app may have crashed. Check Windows Event Viewer or relaunch `Konduit.exe`.