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 Light Background

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#c91b00
+palette = 2=#00c200
+palette = 3=#c7c400
+palette = 4=#0225c7
+palette = 5=#ca30c7
+palette = 6=#00c5c7
+palette = 7=#bababa
+palette = 8=#686868
+palette = 9=#ff6e67
+palette = 10=#39d442
+palette = 11=#ccc934
+palette = 12=#6871ff
+palette = 13=#ff77ff
+palette = 14=#3ad7d9
+palette = 15=#ffffff
+background = #ffffff
+foreground = #000000
+cursor-color = #000000
+cursor-text = #ffffff
+selection-background = #c1deff
+selection-foreground = #000000