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/Slate

@@ -0,0 +1,22 @@
+palette = 0=#222222
+palette = 1=#e2a8bf
+palette = 2=#81d778
+palette = 3=#c4c9c0
+palette = 4=#335856
+palette = 5=#a481d3
+palette = 6=#15ab9c
+palette = 7=#02c5e0
+palette = 8=#ffffff
+palette = 9=#ffcdd9
+palette = 10=#beffa8
+palette = 11=#d0ccca
+palette = 12=#7ab0d2
+palette = 13=#c5a7d9
+palette = 14=#8cdfe0
+palette = 15=#e0e0e0
+background = #222222
+foreground = #35b1d2
+cursor-color = #87d3c4
+cursor-text = #323232
+selection-background = #0f3754
+selection-foreground = #2dffc0