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/One Double Light

@@ -0,0 +1,22 @@
+palette = 0=#454b58
+palette = 1=#f74840
+palette = 2=#25a343
+palette = 3=#cc8100
+palette = 4=#0087c1
+palette = 5=#b50da9
+palette = 6=#009ab7
+palette = 7=#c5b2b3
+palette = 8=#0e131f
+palette = 9=#ff3711
+palette = 10=#00b90e
+palette = 11=#ec9900
+palette = 12=#1065de
+palette = 13=#e500d8
+palette = 14=#00b4dd
+palette = 15=#ffffff
+background = #fafafa
+foreground = #383a43
+cursor-color = #1a1919
+cursor-text = #dbdfe5
+selection-background = #454e5e
+selection-foreground = #1a1919