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/Melange Dark

@@ -0,0 +1,22 @@
+palette = 0=#34302c
+palette = 1=#bd8183
+palette = 2=#78997a
+palette = 3=#e49b5d
+palette = 4=#7f91b2
+palette = 5=#b380b0
+palette = 6=#7b9695
+palette = 7=#c1a78e
+palette = 8=#867462
+palette = 9=#d47766
+palette = 10=#85b695
+palette = 11=#ebc06d
+palette = 12=#a3a9ce
+palette = 13=#cf9bc2
+palette = 14=#89b3b6
+palette = 15=#ece1d7
+background = #292522
+foreground = #ece1d7
+cursor-color = #ece1d7
+cursor-text = #292522
+selection-background = #ece1d7
+selection-foreground = #403a36