bug: cbtop --attach flag silently ignored in TUI mode

[noahgift]

Bug

In crates/apr-cli/src/commands/cbtop_report_tui.rs, the run_tui() function (line 170) accepts _attach: Option<&str> but silently ignores it. The --attach flag is documented in cbtop.rs (apr cbtop --attach realizar) and stored in CbtopConfig, but the TUI never connects to the specified service.

Impact

Users running apr cbtop --attach realizar expect to attach to a running realizar process, but the flag is silently ignored.

Fix

Add warning that --attach is not yet implemented for TUI mode.