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/src/lib.rs

@@ -1 +1,46 @@
 //! ghostty-cli: `ghostty +action` CLI actions (ZIG/src/cli).
+//!
+//! Every action lives in its own module and exposes `run(args)`, which takes
+//! the full process argument vector (including `argv[0]`, like Zig's
+//! `args.argsIterator`) and returns the process exit code. Actions write to
+//! stdout/stderr exactly like the Zig implementation.
+
+#![allow(
+    clippy::wildcard_imports,
+    clippy::struct_field_names,
+    clippy::items_after_statements,
+    clippy::needless_pass_by_value,
+    clippy::too_many_arguments,
+    clippy::type_complexity,
+    clippy::collapsible_if,
+    clippy::doc_lazy_continuation,
+    clippy::doc_overindented_list_items
+)]
+
+#[macro_use]
+mod options;
+
+pub mod action;
+pub mod boo;
+pub mod build_info;
+pub mod crash_report;
+pub mod edit_config;
+pub mod error;
+pub mod ghostty;
+pub mod help;
+pub mod list_actions;
+pub mod list_colors;
+pub mod list_fonts;
+pub mod list_keybinds;
+pub mod list_themes;
+pub mod new_window;
+pub mod show_config;
+pub mod show_face;
+pub mod ssh_cache;
+pub mod tui;
+pub mod validate_config;
+pub mod version;
+
+pub use error::Error;
+pub use ghostty::{Action, run_from_args};
+pub use options::{NoOptions, parse_options};