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/Seti

@@ -0,0 +1,22 @@
+palette = 0=#323232
+palette = 1=#c22832
+palette = 2=#8ec43d
+palette = 3=#e0c64f
+palette = 4=#43a5d5
+palette = 5=#8b57b5
+palette = 6=#8ec43d
+palette = 7=#eeeeee
+palette = 8=#3f3f3f
+palette = 9=#c22832
+palette = 10=#8ec43d
+palette = 11=#e0c64f
+palette = 12=#43a5d5
+palette = 13=#8b57b5
+palette = 14=#8ec43d
+palette = 15=#ffffff
+background = #111213
+foreground = #cacecd
+cursor-color = #e3bf21
+cursor-text = #ad8b00
+selection-background = #303233
+selection-foreground = #cacecd