feat(resources): bundle color themes and compiled xterm-ghostty terminfo

Makes the resources directory self-contained like Ghostty's share/ghostty:
- themes/: the 463 iTerm2-Color-Schemes themes Ghostty 1.3.1 ships
  (release 20260216-151611-fc73ce3), with the upstream MIT license.
- terminfo/: xterm-ghostty compiled with `tic -x` from the terminfo
  source generated by ghostty-termio; `infocmp -x` is identical to the
  installed Ghostty's entry.

The generator script and resources-dir discovery changes follow in a
separate commit.

Test Plan:
- TERMINFO=resources/terminfo infocmp -x xterm-ghostty

resources/themes/Nightfox

@@ -0,0 +1,22 @@
+palette = 0=#393b44
+palette = 1=#c94f6d
+palette = 2=#81b29a
+palette = 3=#dbc074
+palette = 4=#719cd6
+palette = 5=#9d79d6
+palette = 6=#63cdcf
+palette = 7=#dfdfe0
+palette = 8=#575860
+palette = 9=#d16983
+palette = 10=#8ebaa4
+palette = 11=#e0c989
+palette = 12=#86abdc
+palette = 13=#baa1e2
+palette = 14=#7ad5d6
+palette = 15=#e4e4e5
+background = #192330
+foreground = #cdcecf
+cursor-color = #cdcecf
+cursor-text = #192330
+selection-background = #2b3b51
+selection-foreground = #cdcecf