Add `try_get_local_output` helper to retrieve output channel from
context and `local_println!` macro for sending formatted strings. Use
these in track actions to send progress messages to CLI instead of
stdout.

Also reduce log level for connection events from info to debug.

- Refine action service connection handling
- Extend client registry functionality
- Enhance server registry capabilities

The server_entry function now accepts an optional port_override
parameter that allows specifying a custom port instead of using the
configured port from vault configuration. When port_override is greater
than 0, it takes precedence over the configured port.

`with_arc_data` 2. Add new `insert_data` and `insert_arc_data` methods
that take &mut self

Include current connection count in connection open/close log messages
for better monitoring of server load

Lock the vault before starting the server and unlock it during shutdown.

- Fix let_underscore_future warning by properly awaiting async functions
- Make accept_import function async to match add_mapping usage
- Propagate errors properly with ? operator instead of ignoring them
- Replace manual Default implementation with derive attribute
- Replace vec! with array literal to avoid useless_vec warning
- All tests pass and code is now Clippy clean