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 Dark

@@ -0,0 +1,22 @@
+palette = 0=#414453
+palette = 1=#ff8170
+palette = 2=#78c2b3
+palette = 3=#d9c97c
+palette = 4=#4eb0cc
+palette = 5=#ff7ab2
+palette = 6=#b281eb
+palette = 7=#dfdfe0
+palette = 8=#7f8c98
+palette = 9=#ff8170
+palette = 10=#acf2e4
+palette = 11=#ffa14f
+palette = 12=#6bdfff
+palette = 13=#ff7ab2
+palette = 14=#dabaff
+palette = 15=#dfdfe0
+background = #292a30
+foreground = #dfdfe0
+cursor-color = #dfdfe0
+cursor-text = #292a30
+selection-background = #414453
+selection-foreground = #dfdfe0