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/Sakura

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#d52370
+palette = 2=#41af1a
+palette = 3=#bc7053
+palette = 4=#6964ab
+palette = 5=#c71fbf
+palette = 6=#939393
+palette = 7=#998eac
+palette = 8=#786d69
+palette = 9=#f41d99
+palette = 10=#22e529
+palette = 11=#f59574
+palette = 12=#9892f1
+palette = 13=#e90cdd
+palette = 14=#eeeeee
+palette = 15=#cbb6ff
+background = #18131e
+foreground = #dd7bdc
+cursor-color = #ff65fd
+cursor-text = #24242e
+selection-background = #c05cbf
+selection-foreground = #24242e