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/Sugarplum

@@ -0,0 +1,22 @@
+palette = 0=#111147
+palette = 1=#5ca8dc
+palette = 2=#53b397
+palette = 3=#249a84
+palette = 4=#db7ddd
+palette = 5=#d0beee
+palette = 6=#f9f3f9
+palette = 7=#a175d4
+palette = 8=#44447a
+palette = 9=#5cb5dc
+palette = 10=#52deb5
+palette = 11=#01f5c7
+palette = 12=#fa5dfd
+palette = 13=#c6a5fd
+palette = 14=#ffffff
+palette = 15=#b577fd
+background = #111147
+foreground = #db7ddd
+cursor-color = #53b397
+cursor-text = #93f3d7
+selection-background = #5ca8dc
+selection-foreground = #ead8ff