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/iTerm2 Smoooooth

@@ -0,0 +1,22 @@
+palette = 0=#14191e
+palette = 1=#b43c2a
+palette = 2=#00c200
+palette = 3=#c7c400
+palette = 4=#2744c7
+palette = 5=#c040be
+palette = 6=#00c5c7
+palette = 7=#c7c7c7
+palette = 8=#686868
+palette = 9=#dd7975
+palette = 10=#58e790
+palette = 11=#ece100
+palette = 12=#a7abf2
+palette = 13=#e17ee1
+palette = 14=#60fdff
+palette = 15=#ffffff
+background = #15191f
+foreground = #dcdcdc
+cursor-color = #ffffff
+cursor-text = #000000
+selection-background = #b3d7ff
+selection-foreground = #000000