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/Kanso Zen

@@ -0,0 +1,22 @@
+palette = 0=#0d0c0c
+palette = 1=#c4746e
+palette = 2=#8a9a7b
+palette = 3=#c4b28a
+palette = 4=#8ba4b0
+palette = 5=#a292a3
+palette = 6=#8ea4a2
+palette = 7=#c8c093
+palette = 8=#a4a7a4
+palette = 9=#e46876
+palette = 10=#87a987
+palette = 11=#e6c384
+palette = 12=#7fb4ca
+palette = 13=#938aa9
+palette = 14=#7aa89f
+palette = 15=#c5c9c7
+background = #090e13
+foreground = #c5c9c7
+cursor-color = #c5c9c7
+cursor-text = #090e13
+selection-background = #393b44
+selection-foreground = #c5c9c7