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/Synthwave

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#f6188f
+palette = 2=#1ebb2b
+palette = 3=#fdf834
+palette = 4=#2186ec
+palette = 5=#f85a21
+palette = 6=#12c3e2
+palette = 7=#ffffff
+palette = 8=#7f7094
+palette = 9=#f841a0
+palette = 10=#25c141
+palette = 11=#fdf454
+palette = 12=#2f9ded
+palette = 13=#f97137
+palette = 14=#19cde6
+palette = 15=#ffffff
+background = #000000
+foreground = #dad9c7
+cursor-color = #19cde6
+cursor-text = #ffffed
+selection-background = #19cde6
+selection-foreground = #000000