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/Xcode Light

@@ -0,0 +1,22 @@
+palette = 0=#b4d8fd
+palette = 1=#d12f1b
+palette = 2=#3e8087
+palette = 3=#78492a
+palette = 4=#0f68a0
+palette = 5=#ad3da4
+palette = 6=#804fb8
+palette = 7=#262626
+palette = 8=#8a99a6
+palette = 9=#d12f1b
+palette = 10=#23575c
+palette = 11=#78492a
+palette = 12=#0b4f79
+palette = 13=#ad3da4
+palette = 14=#4b21b0
+palette = 15=#262626
+background = #ffffff
+foreground = #262626
+cursor-color = #262626
+cursor-text = #ffffff
+selection-background = #b4d8fd
+selection-foreground = #262626