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/Sea Shells

@@ -0,0 +1,22 @@
+palette = 0=#17384c
+palette = 1=#d15123
+palette = 2=#027c9b
+palette = 3=#fca02f
+palette = 4=#1e4950
+palette = 5=#68d4f1
+palette = 6=#50a3b5
+palette = 7=#deb88d
+palette = 8=#434b53
+palette = 9=#d48678
+palette = 10=#628d98
+palette = 11=#fdd39f
+palette = 12=#1bbcdd
+palette = 13=#bbe3ee
+palette = 14=#87acb4
+palette = 15=#fee4ce
+background = #09141b
+foreground = #deb88d
+cursor-color = #fca02f
+cursor-text = #08131a
+selection-background = #1e4962
+selection-foreground = #fee4ce