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/Piatto Light

@@ -0,0 +1,22 @@
+palette = 0=#414141
+palette = 1=#b23771
+palette = 2=#66781e
+palette = 3=#cd6f34
+palette = 4=#3c5ea8
+palette = 5=#a454b2
+palette = 6=#66781e
+palette = 7=#bfbfbf
+palette = 8=#3f3f3f
+palette = 9=#db3365
+palette = 10=#829429
+palette = 11=#cd6f34
+palette = 12=#3c5ea8
+palette = 13=#a454b2
+palette = 14=#829429
+palette = 15=#f2f2f2
+background = #ffffff
+foreground = #414141
+cursor-color = #5e77c8
+cursor-text = #abbee5
+selection-background = #706b4e
+selection-foreground = #acbcdc