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/Mirage

@@ -0,0 +1,22 @@
+palette = 0=#011627
+palette = 1=#ff9999
+palette = 2=#85cc95
+palette = 3=#ffd700
+palette = 4=#7fb5ff
+palette = 5=#ddb3ff
+palette = 6=#21c7a8
+palette = 7=#ffffff
+palette = 8=#575656
+palette = 9=#ff9999
+palette = 10=#85cc95
+palette = 11=#ffd700
+palette = 12=#7fb5ff
+palette = 13=#ddb3ff
+palette = 14=#85cc95
+palette = 15=#ffffff
+background = #1b2738
+foreground = #a6b2c0
+cursor-color = #ddb3ff
+cursor-text = #ffffff
+selection-background = #273951
+selection-foreground = #d3dbe5