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 Black

@@ -0,0 +1,22 @@
+palette = 0=#252525
+palette = 1=#ed4a46
+palette = 2=#70b433
+palette = 3=#dbb32d
+palette = 4=#368aeb
+palette = 5=#eb6eb7
+palette = 6=#3fc5b7
+palette = 7=#b9b9b9
+palette = 8=#777777
+palette = 9=#ff5e56
+palette = 10=#83c746
+palette = 11=#efc541
+palette = 12=#4f9cfe
+palette = 13=#ff81ca
+palette = 14=#56d8c9
+palette = 15=#dedede
+background = #181818
+foreground = #b9b9b9
+cursor-color = #777777
+cursor-text = #181818
+selection-background = #3b3b3b
+selection-foreground = #646464