base: support modern terminals (ncurses-term + xterm-ghostty alias)

The base only shipped ncurses-base (xterm-256color, tmux), so SSHing in from
WezTerm/Alacritty/foot/Ghostty degraded to a dumb TERM fallback. Following the
maintainer's ansible common role:

- Dockerfile.base: install ncurses-term (terminfo for wezterm, alacritty,
  foot, st, base ghostty entry, and many more).
- rootfs/.../terminfo-src/ghostty.terminfo: thin xterm-ghostty alias
  (use=ghostty) — Ghostty connects as TERM=xterm-ghostty, which no distro
  packages. Compiled into the system db with 'tic -x'; build asserts it
  resolved via infocmp.
- kitty (xterm-kitty) already covered by kitty-terminfo; iTerm2 uses
  xterm-256color (ncurses-base).
- smoke-test: assert ncurses-term emulators + xterm-ghostty alias resolve.

Validated end-to-end in a throwaway container: ncurses-term brings the
entries, the alias compiles and equals the ghostty capability set. hadolint
clean, bash -n OK. Base-affecting, rebuilds base-<hash>. No tag.

scripts/smoke-test.sh

@@ -8,6 +8,8 @@
 #   - new v1.0.0 base additions (pandoc, graphviz, imagemagick, yq, tealdeer)
 #   - typst PDF engine for pandoc (Unreleased) — `pandoc --pdf-engine=typst`
 #   - non-modal editors nano + micro (alongside nvim)
+#   - terminfo for modern emulators: xterm-kitty, xterm-ghostty, wezterm,
+#     alacritty, foot (kitty-terminfo + ncurses-term + compiled ghostty alias)
 #   - tmux 0-indexing baked in /etc/tmux.conf (required for pi-studio variants)
 #   - pi-toolkit cloned at /opt/pi-toolkit
 #   - pi-extensions cloned at /opt/pi-extensions
@@ -77,6 +79,8 @@ run "nvim"            "nvim --version"
 run "nano"            "nano --version"
 run "micro"           "micro --version"
 run "kitty-terminfo"  "infocmp -x xterm-kitty >/dev/null 2>&1"
+run "terminfo: modern emulators (ncurses-term)" 'for t in wezterm alacritty foot ghostty st-256color; do infocmp -x "$t" >/dev/null 2>&1 || exit 1; done'
+run "terminfo: xterm-ghostty alias (tic)" "infocmp -x xterm-ghostty >/dev/null 2>&1"
 run "nvim true-colour default (sysinit.vim)" "nvim --headless -c 'lua os.exit(vim.o.termguicolors and 0 or 1)'"
 run "mempalace-mcp"   "mempalace-mcp --help"
 # v1.0.0 base additions — verify presence and basic functionality.