fix(tunnel): give the unauthenticated tunnel its own acknowledgement

The network acknowledgement that install.sh writes for every passwordless LAN install also satisfied the tunnel guard, so one click on the welcome screen's tunnel link published full terminal control to a public URL with no login and no confirm. The tunnel now needs CODEMAN_ALLOW_UNAUTHENTICATED_TUNNEL or --allow-unauthenticated-tunnel (carried by web -d and service install), and with no login the browser asks before every enable, reading a new loginConfigured field from GET /api/tunnel/status.

The guard is now decided once per request and required again where the tunnel starts, so a save that found the tunnel running can no longer restart it unguarded after a concurrent stop.

Closes #706

src/cli.ts

@@ -950,6 +950,10 @@ function addWebLaunchOptions(cmd: Command): Command {
       '--allow-unauthenticated-network',
       'Allow non-loopback web access without CODEMAN_PASSWORD (dangerous; terminal control is exposed)'
     )
+    .option(
+      '--allow-unauthenticated-tunnel',
+      'Allow starting the Cloudflare tunnel without CODEMAN_PASSWORD (dangerous; publishes terminal control to a public URL; env: CODEMAN_ALLOW_UNAUTHENTICATED_TUNNEL)'
+    )
     .option(
       '--multiuser',
       'Enable opt-in multi-user mode (named users in ~/.codeman/users.json; env: CODEMAN_MULTIUSER)'
@@ -964,6 +968,7 @@ function toWebLaunchOptions(options: {
   baseUrl?: string;
   titleHostname?: string;
   allowUnauthenticatedNetwork?: boolean;
+  allowUnauthenticatedTunnel?: boolean;
   multiuser?: boolean;
 }): WebLaunchOptions {
   const port = parseInt(options.port, 10);
@@ -985,6 +990,7 @@ function toWebLaunchOptions(options: {
     basePath,
     titleHostname: options.titleHostname,
     allowUnauthenticatedNetwork: !!options.allowUnauthenticatedNetwork,
+    allowUnauthenticatedTunnel: !!options.allowUnauthenticatedTunnel,
     multiuser: !!options.multiuser,
   };
 }
@@ -1072,6 +1078,7 @@ webCmd.action(async (options) => {
   const https = launch.https;
   const titleHostname = options.titleHostname;
   const allowUnauthenticatedNetwork = launch.allowUnauthenticatedNetwork ?? false;
+  const allowUnauthenticatedTunnel = launch.allowUnauthenticatedTunnel ?? false;
   const basePath = launch.basePath ?? '';
   // Single source of truth for subsystems that read it directly (e.g. renderers).
   if (basePath) process.env.CODEMAN_BASE_URL = basePath;
@@ -1086,7 +1093,16 @@ webCmd.action(async (options) => {
   try {
     // The server prints its own "running at" line (it also covers the daemon and
     // service launch paths), so this one used to be a duplicate of it.
-    const server = await startWebServer(port, https, false, host, titleHostname, allowUnauthenticatedNetwork, basePath);
+    const server = await startWebServer(
+      port,
+      https,
+      false,
+      host,
+      titleHostname,
+      allowUnauthenticatedNetwork,
+      basePath,
+      allowUnauthenticatedTunnel
+    );
     if (https) {
       console.log(palette.warn('  Note: Accept the self-signed certificate in your browser on first visit'));
     }