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/Cobalt Neon

@@ -0,0 +1,22 @@
+palette = 0=#142631
+palette = 1=#ff2320
+palette = 2=#3ba5ff
+palette = 3=#e9e75c
+palette = 4=#8ff586
+palette = 5=#781aa0
+palette = 6=#8ff586
+palette = 7=#ba46b2
+palette = 8=#fff688
+palette = 9=#d4312e
+palette = 10=#8ff586
+palette = 11=#e9f06d
+palette = 12=#3c7dd2
+palette = 13=#8230a7
+palette = 14=#6cbc67
+palette = 15=#8ff586
+background = #142838
+foreground = #8ff586
+cursor-color = #c4206f
+cursor-text = #8ff586
+selection-background = #094fb1
+selection-foreground = #8ff586