Fix IP redirect to use actual host IP from browser request

- Pass hostIP from HTTP request headers to installer config
- Use req.hostname / req.headers.host instead of Docker gateway IP
- Fixes redirect going to 172.18.0.1 (Docker gateway) instead of actual host
- Now correctly redirects to the IP the browser connected to

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Agent

installer.js

@@ -134,8 +134,8 @@ export async function runInstaller(config, events) {
       });
     }
 
-    // Installation complete - detect host IP for redirect
-    const hostIP = await getHostIP();
+    // Installation complete - use host IP from config (detected from browser request)
+    const hostIP = config.hostIP || 'localhost';
     events.emit('progress', {
       type: 'complete',
       url: `http://${hostIP}:8112`,
@@ -431,23 +431,3 @@ async function waitForHealthy(containerName, timeout, events) {
 
   throw new Error(`${containerName} failed to become healthy within ${timeout}ms`);
 }
-
-async function getHostIP() {
-  try {
-    // Get the gateway IP of the stdout container's network
-    const { stdout } = await execFile('docker', [
-      'inspect',
-      '--format={{range .NetworkSettings.Networks}}{{.Gateway}}{{end}}',
-      'stdout'
-    ]);
-    const gatewayIP = stdout.trim();
-    if (gatewayIP && gatewayIP !== '') {
-      return gatewayIP;
-    }
-  } catch (err) {
-    // Fallback: try to get host.docker.internal IP
-  }
-
-  // Default fallback
-  return 'localhost';
-}

server.js

@@ -37,7 +37,8 @@ app.get('/api/setup/stream', (req, res) => {
 
   // If installation already completed, send completion immediately
   if (installationComplete) {
-    res.write(`data: ${JSON.stringify({ type: 'complete', url: 'http://stdout.local:8112' })}\n\n`);
+    const hostIP = req.hostname || req.headers.host?.split(':')[0] || 'localhost';
+    res.write(`data: ${JSON.stringify({ type: 'complete', url: `http://${hostIP}:8112` })}\n\n`);
     res.end();
     return;
   }
@@ -76,6 +77,9 @@ app.post('/api/setup/start', async (req, res) => {
     return res.status(400).json({ error: 'License key required' });
   }
 
+  // Get host IP from the request (the IP the browser connected to)
+  const hostIP = req.hostname || req.headers.host?.split(':')[0] || 'localhost';
+
   res.json({ status: 'started' });
 
   // Run installer in background
@@ -84,6 +88,7 @@ app.post('/api/setup/start', async (req, res) => {
     adminEmail,
     adminPassword,
     environmentName: environmentName || 'Production',
+    hostIP,
   }, setupEvents).catch(err => {
     setupEvents.emit('progress', { type: 'error', error: err.message });
   });