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/Zenburn

@@ -0,0 +1,22 @@
+palette = 0=#4d4d4d
+palette = 1=#7d5d5d
+palette = 2=#60b48a
+palette = 3=#f0dfaf
+palette = 4=#5d6d7d
+palette = 5=#dc8cc3
+palette = 6=#8cd0d3
+palette = 7=#dcdccc
+palette = 8=#709080
+palette = 9=#dca3a3
+palette = 10=#c3bf9f
+palette = 11=#e0cf9f
+palette = 12=#94bff3
+palette = 13=#ec93d3
+palette = 14=#93e0e3
+palette = 15=#ffffff
+background = #3f3f3f
+foreground = #dcdccc
+cursor-color = #73635a
+cursor-text = #000000
+selection-background = #21322f
+selection-foreground = #c2d87a