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/Batman

@@ -0,0 +1,22 @@
+palette = 0=#1b1d1e
+palette = 1=#e6dc44
+palette = 2=#c8be46
+palette = 3=#f4fd22
+palette = 4=#737174
+palette = 5=#747271
+palette = 6=#62605f
+palette = 7=#c6c5bf
+palette = 8=#505354
+palette = 9=#fff78e
+palette = 10=#fff27d
+palette = 11=#feed6c
+palette = 12=#919495
+palette = 13=#9a9a9d
+palette = 14=#a3a3a6
+palette = 15=#dadbd6
+background = #1b1d1e
+foreground = #6f6f6f
+cursor-color = #fcef0c
+cursor-text = #000000
+selection-background = #4d504c
+selection-foreground = #f0e04a