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/Selenized Dark

@@ -0,0 +1,22 @@
+palette = 0=#184956
+palette = 1=#fa5750
+palette = 2=#75b938
+palette = 3=#dbb32d
+palette = 4=#4695f7
+palette = 5=#f275be
+palette = 6=#41c7b9
+palette = 7=#adbcbc
+palette = 8=#72898f
+palette = 9=#ff665c
+palette = 10=#84c747
+palette = 11=#ebc13d
+palette = 12=#58a3ff
+palette = 13=#ff84cd
+palette = 14=#53d6c7
+palette = 15=#cad8d9
+background = #103c48
+foreground = #adbcbc
+cursor-color = #adbcbc
+cursor-text = #103c48
+selection-background = #184956
+selection-foreground = #53d6c7