feat: tor managed services support

[roshii]

This PR introduces support for Tor-managed hidden services, providing a more secure and simplified way to run persistent onion services without requiring Tor control port access.

Changes

Core Implementation

Modified JMHiddenService class in src/jmbase/twisted_utils.py:

• Added detection for tor-managed: prefixed hidden service directories
• Implemented start_tor_managed_onion() method that polls for hostname file creation
• Added create_filesystem_onion_ep() for better code organization
• No Tor control port connection needed in managed mode

Daemon Integration

Updated OnionMessageChannel in src/jmdaemon/onionmc.py:

• Added _start_listener() method for cleaner listener setup
• Modified genesis node handling to work with managed services
• Improved error handling and callback management

Testing

Added comprehensive test coverage:

• test/jmbase/test_twisted_utils.py: Tests for hidden service mode detection and ephemeral service creation
• test/jmdaemon/test_onionmc.py: Tests for listener setup and different host/port configurations

Benefits

• Optionally eliminates the need for Tor control port access, reducing attack surface
• Hidden services ca be configured entirely in torrc, no JoinMarket-specific setup required
• Existing ephemeral and persistent modes continue to work unchanged
• HiddenServicePOWDefense ready 🚀

Usage

To use Tor-managed hidden services, configure your joinmarket.cfg:

[MESSAGING:onion]
hidden_service_dir = tor-managed:/path/to/tor/hidden/service/dir

The corresponding torrc entry would be:

HiddenServiceDir /path/to/tor/hidden/service/dir
HiddenServicePort 80 127.0.0.1:8080

The code automatically detects the tor-managed: prefix and switches to managed mode, polling for the hostname file that Tor creates.