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/Seafoam Pastel

@@ -0,0 +1,22 @@
+palette = 0=#757575
+palette = 1=#825d4d
+palette = 2=#728c62
+palette = 3=#ada16d
+palette = 4=#4d7b82
+palette = 5=#8a7267
+palette = 6=#729494
+palette = 7=#e0e0e0
+palette = 8=#8a8a8a
+palette = 9=#cf937a
+palette = 10=#98d9aa
+palette = 11=#fae79d
+palette = 12=#7ac3cf
+palette = 13=#d6b2a1
+palette = 14=#ade0e0
+palette = 15=#e0e0e0
+background = #243435
+foreground = #d4e7d4
+cursor-color = #57647a
+cursor-text = #323232
+selection-background = #ffffff
+selection-foreground = #9e8b13