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/Grey Green

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#fe1414
+palette = 2=#74ff00
+palette = 3=#f1ff01
+palette = 4=#00deff
+palette = 5=#ff00f0
+palette = 6=#00ffbc
+palette = 7=#ffffff
+palette = 8=#666666
+palette = 9=#ff3939
+palette = 10=#00ff44
+palette = 11=#ffd100
+palette = 12=#00afff
+palette = 13=#ff008a
+palette = 14=#00ffd3
+palette = 15=#f5ecec
+background = #002a1a
+foreground = #ffffff
+cursor-color = #fff400
+cursor-text = #aeb1b0
+selection-background = #517e50
+selection-foreground = #e2e2e2