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/Tomorrow Night Eighties

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#f2777a
+palette = 2=#99cc99
+palette = 3=#ffcc66
+palette = 4=#6699cc
+palette = 5=#cc99cc
+palette = 6=#66cccc
+palette = 7=#ffffff
+palette = 8=#595959
+palette = 9=#f2777a
+palette = 10=#99cc99
+palette = 11=#ffcc66
+palette = 12=#6699cc
+palette = 13=#cc99cc
+palette = 14=#66cccc
+palette = 15=#ffffff
+background = #2d2d2d
+foreground = #cccccc
+cursor-color = #cccccc
+cursor-text = #2d2d2d
+selection-background = #515151
+selection-foreground = #cccccc