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/Adwaita

@@ -0,0 +1,22 @@
+palette = 0=#241f31
+palette = 1=#c01c28
+palette = 2=#2ec27e
+palette = 3=#e8b504
+palette = 4=#1e78e4
+palette = 5=#9841bb
+palette = 6=#0ab9dc
+palette = 7=#c0bfbc
+palette = 8=#5e5c64
+palette = 9=#ed333b
+palette = 10=#4ad67c
+palette = 11=#d2be36
+palette = 12=#51a1ff
+palette = 13=#c061cb
+palette = 14=#4fd2fd
+palette = 15=#f6f5f4
+background = #ffffff
+foreground = #000000
+cursor-color = #000000
+cursor-text = #ffffff
+selection-background = #c0bfbc
+selection-foreground = #000000