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/GitHub Dark Dimmed

@@ -0,0 +1,22 @@
+palette = 0=#545d68
+palette = 1=#f47067
+palette = 2=#57ab5a
+palette = 3=#c69026
+palette = 4=#539bf5
+palette = 5=#b083f0
+palette = 6=#39c5cf
+palette = 7=#909dab
+palette = 8=#636e7b
+palette = 9=#ff938a
+palette = 10=#6bc46d
+palette = 11=#daaa3f
+palette = 12=#6cb6ff
+palette = 13=#dcbdfb
+palette = 14=#56d4dd
+palette = 15=#cdd9e5
+background = #22272e
+foreground = #adbac7
+cursor-color = #539bf5
+cursor-text = #93dbff
+selection-background = #adbac7
+selection-foreground = #22272e