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/Nocturnal Winter

@@ -0,0 +1,22 @@
+palette = 0=#4d4d4d
+palette = 1=#f12d52
+palette = 2=#09cd7e
+palette = 3=#f5f17a
+palette = 4=#3182e0
+palette = 5=#ff2b6d
+palette = 6=#09c87a
+palette = 7=#fcfcfc
+palette = 8=#808080
+palette = 9=#f16d86
+palette = 10=#0ae78d
+palette = 11=#fffc67
+palette = 12=#6096ff
+palette = 13=#ff78a2
+palette = 14=#0ae78d
+palette = 15=#ffffff
+background = #0d0d17
+foreground = #e6e5e5
+cursor-color = #e6e5e5
+cursor-text = #a6a6a6
+selection-background = #adbdd0
+selection-foreground = #000000