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 Planet

@@ -0,0 +1,22 @@
+palette = 0=#202020
+palette = 1=#8c3432
+palette = 2=#728271
+palette = 3=#e8bf6a
+palette = 4=#69819e
+palette = 5=#896492
+palette = 6=#5b8390
+palette = 7=#b9aa99
+palette = 8=#676767
+palette = 9=#b55242
+palette = 10=#869985
+palette = 11=#ebeb91
+palette = 12=#60827e
+palette = 13=#de4974
+palette = 14=#38add8
+palette = 15=#d6bfb8
+background = #222222
+foreground = #c2b790
+cursor-color = #c2b790
+cursor-text = #202020
+selection-background = #1b324a
+selection-foreground = #bcb291