feat: Add PWA support and CORS configuration

- Configure VitePWA with manifest, icons and service worker
- Add PwaInstallBanner component for install prompt in header
- Enable CORS for z590.interno.com access
- Use dynamic hostname for terminal WebSocket connection
- Add generate-icons script with sharp for PWA icons
- Fix theme-color to match header background

server/services/terminal.ts

@@ -80,6 +80,17 @@ export function startTerminalServer() {
     fetch(req, server) {
       const url = new URL(req.url)
 
+      const corsHeaders = {
+        'Access-Control-Allow-Origin': '*',
+        'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
+        'Access-Control-Allow-Headers': 'Content-Type'
+      }
+
+      // CORS preflight
+      if (req.method === 'OPTIONS') {
+        return new Response(null, { headers: corsHeaders })
+      }
+
       // Health check with session info
       if (url.pathname === '/health') {
         const sessionsInfo = Array.from(sessions.entries()).map(([id, s]) => ({
@@ -93,7 +104,7 @@ export function startTerminalServer() {
           status: 'ok',
           sessions: sessionsInfo,
           cwd: WORKING_DIR
-        })
+        }, { headers: corsHeaders })
       }
 
       // List active sessions