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/Mellifluous

@@ -0,0 +1,22 @@
+palette = 0=#1a1a1a
+palette = 1=#d29393
+palette = 2=#b3b393
+palette = 3=#cbaa89
+palette = 4=#a8a1be
+palette = 5=#b39fb0
+palette = 6=#c0af8c
+palette = 7=#dadada
+palette = 8=#5b5b5b
+palette = 9=#c95954
+palette = 10=#828040
+palette = 11=#a6794c
+palette = 12=#5a6599
+palette = 13=#9c6995
+palette = 14=#74a39e
+palette = 15=#ffffff
+background = #1a1a1a
+foreground = #dadada
+cursor-color = #bfad9e
+cursor-text = #1a1a1a
+selection-background = #2d2d2d
+selection-foreground = #c0af8c