feat: Implement Smart Tunnel async architecture (v6.0.0b1)

- Replaced blocking pexpect interact with asyncio-based multiplexing.
- Implemented LocalStream and RemoteStream for agnostic I/O handling.
- Real-time SIGWINCH window resizing support.
- 'Ghost buffer' mitigation for clean, artifact-free session handovers.
- Upgraded _logclean into a mini terminal emulator to accurately process ANSI, backspaces, and inline clears.
- Continuous auto-saving for logs without blocking the main thread.
- Bumped version to 6.0.0b1 and regenerated pdoc documentation.

connpy/services/node_service.py

@@ -182,7 +182,7 @@ class NodeService(BaseService):
         n = node(unique_id, **resolved_data, config=self.config)
         if sftp:
             n.protocol = "sftp"
-            
+
         n.interact(debug=debug, logger=logger)
 
     def move_node(self, src_id, dst_id, copy=False):