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/Elegant

@@ -0,0 +1,22 @@
+palette = 0=#0a1222
+palette = 1=#ff0257
+palette = 2=#85cc95
+palette = 3=#ffcb8b
+palette = 4=#8dabe1
+palette = 5=#c792eb
+palette = 6=#78ccf0
+palette = 7=#ffffff
+palette = 8=#575656
+palette = 9=#ff0057
+palette = 10=#85cc95
+palette = 11=#ffcb8b
+palette = 12=#8dabe1
+palette = 13=#c792eb
+palette = 14=#3facef
+palette = 15=#ffffff
+background = #292b31
+foreground = #ced2d6
+cursor-color = #00beff
+cursor-text = #ffffff
+selection-background = #d5d5d5
+selection-foreground = #144385