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 Light Hard

@@ -0,0 +1,22 @@
+palette = 0=#f9f5d7
+palette = 1=#cc241d
+palette = 2=#98971a
+palette = 3=#d79921
+palette = 4=#458588
+palette = 5=#b16286
+palette = 6=#689d6a
+palette = 7=#7c6f64
+palette = 8=#928374
+palette = 9=#9d0006
+palette = 10=#79740e
+palette = 11=#b57614
+palette = 12=#076678
+palette = 13=#8f3f71
+palette = 14=#427b58
+palette = 15=#3c3836
+background = #f9f5d7
+foreground = #3c3836
+cursor-color = #3c3836
+cursor-text = #f9f5d7
+selection-background = #3c3836
+selection-foreground = #f9f5d7