fix(security): bind WhatsApp bridge to localhost + optional token auth

nanobot/cli/commands.py

@@ -636,14 +636,20 @@ def _get_bridge_dir() -> Path:
 def channels_login():
     """Link device via QR code."""
     import subprocess
+    from nanobot.config.loader import load_config
     
+    config = load_config()
     bridge_dir = _get_bridge_dir()
     
     console.print(f"{__logo__} Starting bridge...")
     console.print("Scan the QR code to connect.\n")
     
+    env = {**os.environ}
+    if config.channels.whatsapp.bridge_token:
+        env["BRIDGE_TOKEN"] = config.channels.whatsapp.bridge_token
+    
     try:
-        subprocess.run(["npm", "start"], cwd=bridge_dir, check=True)
+        subprocess.run(["npm", "start"], cwd=bridge_dir, check=True, env=env)
     except subprocess.CalledProcessError as e:
         console.print(f"[red]Bridge failed: {e}[/red]")
     except FileNotFoundError: