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/urban

@@ -0,0 +1,22 @@
+palette = 0=#33303b
+palette = 1=#87404f
+palette = 2=#74934e
+palette = 3=#ae835a
+palette = 4=#615772
+palette = 5=#854b64
+palette = 6=#625464
+palette = 7=#c0a79a
+palette = 8=#5c5865
+palette = 9=#87404f
+palette = 10=#74934e
+palette = 11=#ae835a
+palette = 12=#615772
+palette = 13=#854b64
+palette = 14=#625464
+palette = 15=#c0a79a
+background = #312e39
+foreground = #c0a79a
+cursor-color = #c0a79a
+cursor-text = #312e39
+selection-background = #c0a79a
+selection-foreground = #312e39