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 hc

@@ -0,0 +1,22 @@
+palette = 0=#43454b
+palette = 1=#ff8a7a
+palette = 2=#83c9bc
+palette = 3=#d9c668
+palette = 4=#4ec4e6
+palette = 5=#ff85b8
+palette = 6=#cda1ff
+palette = 7=#ffffff
+palette = 8=#838991
+palette = 9=#ff8a7a
+palette = 10=#b1faeb
+palette = 11=#ffa14f
+palette = 12=#6bdfff
+palette = 13=#ff85b8
+palette = 14=#e5cfff
+palette = 15=#ffffff
+background = #1f1f24
+foreground = #ffffff
+cursor-color = #ffffff
+cursor-text = #1f1f24
+selection-background = #43454b
+selection-foreground = #ffffff