fix(auth): real client IP rate-limiting + remote default-password guard

- Add custom-server.js: inject unspoofable socket IP, strip client XFF
  (wired into Docker CMD + CLI spawn + build-cli copy)
- loginLimiter: key on trusted x-9r-real-ip, TRUST_PROXY opt-in, global fallback
- Force password change on first remote login while default is in use
- Add /api/auth/reset-password (local-only) so CLI reset writes live SQLite
- CLI settings: reset via API instead of stale db.json
- Fix OAuth modals opening duplicate browser tabs on add-connection
- Add cli:pack / cli:publish scripts

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/auth/loginLimiter.js

@@ -46,7 +46,15 @@ export function recordSuccess(ip) {
 }
 
 export function getClientIp(request) {
-  const xff = request.headers.get("x-forwarded-for");
-  if (xff) return xff.split(",")[0].trim();
-  return request.headers.get("x-real-ip") || "unknown";
+  // Trusted: set from TCP socket by custom-server.js (client cannot spoof).
+  const realIp = request.headers.get("x-9r-real-ip");
+  if (realIp) return realIp;
+  // Behind a trusted reverse proxy that overwrites XFF with the real client IP.
+  if (process.env.TRUST_PROXY === "true") {
+    const xff = request.headers.get("x-forwarded-for");
+    if (xff) return xff.split(",")[0].trim();
+  }
+  // Direct exposure without custom-server: single bucket so spoofed XFF
+  // rotation cannot escape the limiter.
+  return "unknown";
 }

src/lib/tunnel/index.js

@@ -31,6 +31,8 @@ export {
   isTailscaleLoggedIn,
   isTailscaleLoggedInStrict,
   isSystemDaemonRunning,
+  isDaemonAlive,
+  startFunnel,
   getTailscaleBin,
   installTailscale,
   startLogin,

src/lib/tunnel/tailscale/tailscale.js

@@ -519,6 +519,11 @@ function isDaemonTunMode() {
   } catch { return null; }
 }
 
+/** Daemon process alive (independent of funnel state) — mirrors cloudflared PID check semantic. */
+export function isDaemonAlive() {
+  return isDaemonTunMode() !== null;
+}
+
 /**
  * Start tailscaled.
  * - With sudoPassword: TUN mode (root) → Funnel TLS works
@@ -550,8 +555,9 @@ export async function startDaemonWithPassword(sudoPassword) {
     return;
   }
 
-  const wantTun = !!sudoPassword;
   const currentMode = isDaemonTunMode(); // true=TUN, false=userspace, null=not running
+  // No password but a healthy TUN daemon already runs → keep TUN, never downgrade-kill it.
+  const wantTun = sudoPassword ? true : currentMode === true;
 
   // Daemon already running in correct mode → reuse
   if (currentMode !== null && currentMode === wantTun) {