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/Aizen Dark

@@ -0,0 +1,22 @@
+palette = 0=#1a1a1a
+palette = 1=#f08898
+palette = 2=#a4e09c
+palette = 3=#f5dea4
+palette = 4=#84b4f8
+palette = 5=#c8a2f4
+palette = 6=#90dcd0
+palette = 7=#d0d6f0
+palette = 8=#444444
+palette = 9=#f08898
+palette = 10=#a4e09c
+palette = 11=#f5dea4
+palette = 12=#84b4f8
+palette = 13=#c8a2f4
+palette = 14=#90dcd0
+palette = 15=#ffffff
+background = #1a1a1a
+foreground = #d0d6f0
+cursor-color = #f8b080
+cursor-text = #1a1a1a
+selection-background = #333333
+selection-foreground = #d0d6f0