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/Nvim Light

@@ -0,0 +1,22 @@
+palette = 0=#07080d
+palette = 1=#590008
+palette = 2=#005523
+palette = 3=#6b5300
+palette = 4=#004c73
+palette = 5=#470045
+palette = 6=#007373
+palette = 7=#a1a4ab
+palette = 8=#4f5258
+palette = 9=#590008
+palette = 10=#005523
+palette = 11=#6b5300
+palette = 12=#004c73
+palette = 13=#470045
+palette = 14=#007373
+palette = 15=#eef1f8
+background = #e0e2ea
+foreground = #14161b
+cursor-color = #9b9ea4
+cursor-text = #14161b
+selection-background = #9b9ea4
+selection-foreground = #14161b