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/Electron Highlighter

@@ -0,0 +1,22 @@
+palette = 0=#15161f
+palette = 1=#ff6c8d
+palette = 2=#00ffc3
+palette = 3=#ffd7a9
+palette = 4=#77abff
+palette = 5=#daa4f4
+palette = 6=#00fdff
+palette = 7=#778faf
+palette = 8=#4a6789
+palette = 9=#ff6c8d
+palette = 10=#00ffc3
+palette = 11=#ffd7a9
+palette = 12=#77abff
+palette = 13=#daa4f4
+palette = 14=#00fdff
+palette = 15=#c3cee2
+background = #23283d
+foreground = #a5b6d4
+cursor-color = #a5b6d4
+cursor-text = #1a1b27
+selection-background = #25345a
+selection-foreground = #a5b6d4