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

@@ -0,0 +1,22 @@
+palette = 0=#3e3e3e
+palette = 1=#970b16
+palette = 2=#07962a
+palette = 3=#c5bb94
+palette = 4=#003e8a
+palette = 5=#e94691
+palette = 6=#7cc4df
+palette = 7=#b2b2b2
+palette = 8=#666666
+palette = 9=#de0000
+palette = 10=#7ac895
+palette = 11=#d7b600
+palette = 12=#2e6cba
+palette = 13=#f29592
+palette = 14=#00c7cb
+palette = 15=#ffffff
+background = #f4f4f4
+foreground = #3e3e3e
+cursor-color = #3f3f3f
+cursor-text = #f4f4f4
+selection-background = #a9c1e2
+selection-foreground = #535353