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/Synthwave Alpha

@@ -0,0 +1,22 @@
+palette = 0=#241b30
+palette = 1=#e60a70
+palette = 2=#00986c
+palette = 3=#adad3e
+palette = 4=#6e29ad
+palette = 5=#b300ad
+palette = 6=#00b0b1
+palette = 7=#b9b1bc
+palette = 8=#7f7094
+palette = 9=#e60a70
+palette = 10=#0ae4a4
+palette = 11=#f9f972
+palette = 12=#aa54f9
+palette = 13=#ff00f6
+palette = 14=#00fbfd
+palette = 15=#f2f2e3
+background = #241b30
+foreground = #f2f2e3
+cursor-color = #f2f2e3
+cursor-text = #241b30
+selection-background = #6e29ad
+selection-foreground = #f2f2e3