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/Darkside

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#e8341c
+palette = 2=#68c256
+palette = 3=#f2d42c
+palette = 4=#1c98e8
+palette = 5=#8e69c9
+palette = 6=#1c98e8
+palette = 7=#bababa
+palette = 8=#4c4c4c
+palette = 9=#e05a4f
+palette = 10=#77b869
+palette = 11=#efd64b
+palette = 12=#387cd3
+palette = 13=#957bbe
+palette = 14=#3d97e2
+palette = 15=#bababa
+background = #222324
+foreground = #bababa
+cursor-color = #bbbbbb
+cursor-text = #ffffff
+selection-background = #303333
+selection-foreground = #bababa