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/Red Sands

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#ff3f00
+palette = 2=#00bb00
+palette = 3=#e7b000
+palette = 4=#0072ff
+palette = 5=#bb00bb
+palette = 6=#00bbbb
+palette = 7=#bbbbbb
+palette = 8=#6e6e6e
+palette = 9=#d41a1a
+palette = 10=#00bb00
+palette = 11=#e7b000
+palette = 12=#0072ae
+palette = 13=#ff55ff
+palette = 14=#55ffff
+palette = 15=#ffffff
+background = #7a251e
+foreground = #d7c9a7
+cursor-color = #ffffff
+cursor-text = #000000
+selection-background = #a4a390
+selection-foreground = #000000