refactor(installation): update scoop installation method (#9243)

Signed-off-by: Chawye Hsu <su+git@chawyehsu.com>

README.md

@@ -26,7 +26,7 @@ curl -fsSL https://opencode.ai/install | bash
 
 # Package managers
 npm i -g opencode-ai@latest        # or bun/pnpm/yarn
-scoop bucket add extras; scoop install extras/opencode  # Windows
+scoop install opencode             # Windows
 choco install opencode             # Windows
 brew install anomalyco/tap/opencode # macOS and Linux (recommended, always up to date)
 brew install opencode              # macOS and Linux (official brew formula, updated less)
@@ -52,6 +52,8 @@ OpenCode is also available as a desktop application. Download directly from the
 ```bash
 # macOS (Homebrew)
 brew install --cask opencode-desktop
+# Windows (Scoop)
+scoop bucket add extras; scoop install extras/opencode-desktop
 ```
 
 #### Installation Directory