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/Alabaster

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#aa3731
+palette = 2=#448c27
+palette = 3=#cb9000
+palette = 4=#325cc0
+palette = 5=#7a3e9d
+palette = 6=#0083b2
+palette = 7=#b7b7b7
+palette = 8=#777777
+palette = 9=#f05050
+palette = 10=#60cb00
+palette = 11=#f2af50
+palette = 12=#007acc
+palette = 13=#e64ce6
+palette = 14=#00aacb
+palette = 15=#f7f7f7
+background = #f7f7f7
+foreground = #000000
+cursor-color = #007acc
+cursor-text = #bfdbfe
+selection-background = #bfdbfe
+selection-foreground = #000000