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/Dawnfox

@@ -0,0 +1,22 @@
+palette = 0=#575279
+palette = 1=#b4637a
+palette = 2=#618774
+palette = 3=#ea9d34
+palette = 4=#286983
+palette = 5=#907aa9
+palette = 6=#56949f
+palette = 7=#b2b6bd
+palette = 8=#5f5695
+palette = 9=#c26d85
+palette = 10=#629f81
+palette = 11=#eea846
+palette = 12=#2d81a3
+palette = 13=#9a80b9
+palette = 14=#5ca7b4
+palette = 15=#e6ebf3
+background = #faf4ed
+foreground = #575279
+cursor-color = #575279
+cursor-text = #faf4ed
+selection-background = #d0d8d8
+selection-foreground = #575279