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/iTerm2 Solarized Light

@@ -0,0 +1,22 @@
+palette = 0=#073642
+palette = 1=#dc322f
+palette = 2=#859900
+palette = 3=#b58900
+palette = 4=#268bd2
+palette = 5=#d33682
+palette = 6=#2aa198
+palette = 7=#bbb5a2
+palette = 8=#002b36
+palette = 9=#cb4b16
+palette = 10=#586e75
+palette = 11=#657b83
+palette = 12=#839496
+palette = 13=#6c71c4
+palette = 14=#93a1a1
+palette = 15=#fdf6e3
+background = #fdf6e3
+foreground = #657b83
+cursor-color = #657b83
+cursor-text = #eee8d5
+selection-background = #eee8d5
+selection-foreground = #586e75