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/Havn Skumring

@@ -0,0 +1,22 @@
+palette = 0=#252c47
+palette = 1=#ea563e
+palette = 2=#6ead7b
+palette = 3=#f8b330
+palette = 4=#596cf7
+palette = 5=#7c719e
+palette = 6=#d588c1
+palette = 7=#dce0ee
+palette = 8=#38425c
+palette = 9=#d17264
+palette = 10=#8c9e8f
+palette = 11=#eac58c
+palette = 12=#5186cb
+palette = 13=#9b7cee
+palette = 14=#d17ab6
+palette = 15=#fff6e1
+background = #111522
+foreground = #d6dbeb
+cursor-color = #277a6f
+cursor-text = #e0e4f3
+selection-background = #2b514b
+selection-foreground = #dce0ef