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/Gruvbox Dark Hard

@@ -0,0 +1,22 @@
+palette = 0=#1d2021
+palette = 1=#cc241d
+palette = 2=#98971a
+palette = 3=#d79921
+palette = 4=#458588
+palette = 5=#b16286
+palette = 6=#689d6a
+palette = 7=#a89984
+palette = 8=#928374
+palette = 9=#fb4934
+palette = 10=#b8bb26
+palette = 11=#fabd2f
+palette = 12=#83a598
+palette = 13=#d3869b
+palette = 14=#8ec07c
+palette = 15=#ebdbb2
+background = #1d2021
+foreground = #ebdbb2
+cursor-color = #ebdbb2
+cursor-text = #1d2021
+selection-background = #665c54
+selection-foreground = #ebdbb2