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/One Half Dark

@@ -0,0 +1,22 @@
+palette = 0=#282c34
+palette = 1=#e06c75
+palette = 2=#98c379
+palette = 3=#e5c07b
+palette = 4=#61afef
+palette = 5=#c678dd
+palette = 6=#56b6c2
+palette = 7=#dcdfe4
+palette = 8=#5d677a
+palette = 9=#e06c75
+palette = 10=#98c379
+palette = 11=#e5c07b
+palette = 12=#61afef
+palette = 13=#c678dd
+palette = 14=#56b6c2
+palette = 15=#dcdfe4
+background = #282c34
+foreground = #dcdfe4
+cursor-color = #a3b3cc
+cursor-text = #e9ecf1
+selection-background = #474e5d
+selection-foreground = #dcdfe4