feat(cli): port ghostty +action CLI commands

Ports ZIG/src/cli into ghostty-cli: action detection/dispatch with
per-action --help, and the actions help, version, list-actions,
list-colors, list-keybinds, list-themes (plain listing plus an
interactive ratatui browser mirroring Ghostty's libvaxis UI),
show-config, validate-config, edit-config, crash-report (listing),
ssh-cache and boo (235 embedded frames).

Verified byte-for-byte against the installed Ghostty 1.3.1 for stdout,
stderr and exit codes of most actions, incl. tty output in a pty at
widths 20-200. Known differences: +list-colors --plain prints all 782
colors (Ghostty truncates at 617 because it never flushes), +version
has placeholder build info until build_info::set is wired up.

Deferred: list-fonts, show-face (need font discovery integration) and
new-window (needs GTK IPC); they return NotYetAvailable for now.

Test Plan:
- cargo test -p ghostty-cli (86 tests)
- cargo run -p ghostty-cli --example cli -- +list-keybinds --plain
  and diff against `ghostty +list-keybinds --plain`

crates/ghostty-cli/Cargo.toml

@@ -5,9 +5,17 @@ edition.workspace = true
 license.workspace = true
 
 [dependencies]
+flate2 = "1.1.10"
 ghostty-config.workspace = true
 ghostty-input.workspace = true
 ghostty-os.workspace = true
+log = "0.4.34"
+ratatui = "0.30.2"
+thiserror = "2.0.21"
+unicode-width = "0.2.2"
 
 [lints]
 workspace = true
+
+[dev-dependencies]
+tempfile = "3.27.0"