docs: русский README — Windows, Desktop и CLI

Убрана английская половина. Установка для Windows PowerShell, OpenCode
Desktop на всех ОС, WSL vs native, ключ для GUI.

README.md

@@ -10,38 +10,16 @@
 |-------|-----|
 | [`opencode/`](opencode/) | Провайдер OpenCode **Arka-AI**: установщик, плагин, skill, каталог чат-моделей |
 
-Однострочник OpenCode (macOS/Linux/WSL):
+OpenCode, macOS / Linux / WSL:
 
 ```bash
 curl -fsSL https://git.arka-ai.ru/arka/public/raw/branch/main/opencode/install-arka-provider.sh | bash
 ```
 
-Windows (PowerShell, CLI и Desktop):
+OpenCode, Windows (PowerShell, CLI и Desktop):
 
 ```powershell
 irm https://git.arka-ai.ru/arka/public/raw/branch/main/opencode/install-arka-provider.ps1 | iex
 ```
 
----
-
-Public Arka AI downloads, docs, and scripts. Anonymous raw URLs, no token.
-
-`https://git.arka-ai.ru/arka/public/raw/branch/main/<path>`
-
-One top-level folder per product. No private source.
-
-| Folder | What |
-|--------|------|
-| [`opencode/`](opencode/) | OpenCode **Arka-AI** provider: installer, plugin, skill, chat catalog |
-
-OpenCode one-liner (macOS/Linux/WSL):
-
-```bash
-curl -fsSL https://git.arka-ai.ru/arka/public/raw/branch/main/opencode/install-arka-provider.sh | bash
-```
-
-Windows (PowerShell, CLI and Desktop):
-
-```powershell
-irm https://git.arka-ai.ru/arka/public/raw/branch/main/opencode/install-arka-provider.ps1 | iex
-```
+Подробности: [opencode/README.md](opencode/README.md) — Windows, Desktop, установка из чата OpenCode.