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/Lavandula

@@ -0,0 +1,22 @@
+palette = 0=#230046
+palette = 1=#7d1625
+palette = 2=#337e6f
+palette = 3=#7f6f49
+palette = 4=#4f4a7f
+palette = 5=#5a3f7f
+palette = 6=#58777f
+palette = 7=#736e7d
+palette = 8=#443a53
+palette = 9=#e05167
+palette = 10=#52e0c4
+palette = 11=#e0c386
+palette = 12=#8e87e0
+palette = 13=#a776e0
+palette = 14=#9ad4e0
+palette = 15=#8c91fa
+background = #050014
+foreground = #736e7d
+cursor-color = #8c91fa
+cursor-text = #050014
+selection-background = #37323c
+selection-foreground = #8c91fa