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/Earthsong

@@ -0,0 +1,22 @@
+palette = 0=#121418
+palette = 1=#c94234
+palette = 2=#85c54c
+palette = 3=#f5ae2e
+palette = 4=#1398b9
+palette = 5=#d0633d
+palette = 6=#509552
+palette = 7=#e5c6aa
+palette = 8=#675f54
+palette = 9=#ff645a
+palette = 10=#98e036
+palette = 11=#e0d561
+palette = 12=#5fdaff
+palette = 13=#ff9269
+palette = 14=#84f088
+palette = 15=#f6f7ec
+background = #292520
+foreground = #e5c7a9
+cursor-color = #f6f7ec
+cursor-text = #292520
+selection-background = #121418
+selection-foreground = #e5c7a9