feat: Add opt-out setting for anonymous usage reporting (#743)

* refactor: align VS Code update checks with web runtime parity

- VS Code now uses file-based installId (shared with web server)
- Accepts platform/arch from webview for consistent behavior
- Usage data collection now matches web implementation

* feat: Add opt-out setting for anonymous usage reporting in Appearance

- Add privacy control in Appearance settings to opt-out of anonymous usage reports
- Usage data includes only app version, platform, and runtime - no personal data or code collected
- Setting persists across all runtimes and controls the reportUsage parameter in update checks

packages/vscode/webview/main.tsx

@@ -754,12 +754,16 @@ const handleLocalApiRequest = async (url: URL, init?: RequestInit) => {
       const currentVersion = url.searchParams.get('currentVersion') || undefined;
       const instanceMode = url.searchParams.get('instanceMode') || 'local';
       const deviceClass = url.searchParams.get('deviceClass') || 'desktop';
+      const platform = url.searchParams.get('platform') || undefined;
+      const arch = url.searchParams.get('arch') || undefined;
       const reportUsageRaw = (url.searchParams.get('reportUsage') || 'true').toLowerCase();
       const reportUsage = !(reportUsageRaw === 'false' || reportUsageRaw === '0' || reportUsageRaw === 'no');
       const data = await sendBridgeMessage('api:openchamber:update-check', {
         currentVersion,
         instanceMode,
         deviceClass,
+        platform,
+        arch,
         reportUsage,
       });
       return new Response(JSON.stringify(data), { status: 200, headers: { 'Content-Type': 'application/json' } });