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/Highway

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#d00e18
+palette = 2=#138034
+palette = 3=#ffcb3e
+palette = 4=#006bb3
+palette = 5=#783482
+palette = 6=#455271
+palette = 7=#ededed
+palette = 8=#5d504a
+palette = 9=#f07e18
+palette = 10=#b1d130
+palette = 11=#fff120
+palette = 12=#4fc2fd
+palette = 13=#de0071
+palette = 14=#5d504a
+palette = 15=#ffffff
+background = #222225
+foreground = #ededed
+cursor-color = #e0d9b9
+cursor-text = #1f192a
+selection-background = #384564
+selection-foreground = #ededed