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/Medallion

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#b64c00
+palette = 2=#7c8b16
+palette = 3=#d3bd26
+palette = 4=#616bb0
+palette = 5=#8c5a90
+palette = 6=#916c25
+palette = 7=#cac29a
+palette = 8=#5e5219
+palette = 9=#ff9149
+palette = 10=#b2ca3b
+palette = 11=#ffe54a
+palette = 12=#acb8ff
+palette = 13=#ffa0ff
+palette = 14=#ffbc51
+palette = 15=#fed698
+background = #1d1908
+foreground = #cac296
+cursor-color = #d3ba30
+cursor-text = #fffc7d
+selection-background = #626dac
+selection-foreground = #cac29a