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/Black Metal

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#486e6f
+palette = 2=#dd9999
+palette = 3=#a06666
+palette = 4=#888888
+palette = 5=#999999
+palette = 6=#aaaaaa
+palette = 7=#c1c1c1
+palette = 8=#404040
+palette = 9=#486e6f
+palette = 10=#dd9999
+palette = 11=#a06666
+palette = 12=#888888
+palette = 13=#999999
+palette = 14=#aaaaaa
+palette = 15=#c1c1c1
+background = #000000
+foreground = #c1c1c1
+cursor-color = #c1c1c1
+cursor-text = #8e8e8e
+selection-background = #c1c1c1
+selection-foreground = #000000