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/GitHub Dark Default

@@ -0,0 +1,22 @@
+palette = 0=#484f58
+palette = 1=#ff7b72
+palette = 2=#3fb950
+palette = 3=#d29922
+palette = 4=#58a6ff
+palette = 5=#bc8cff
+palette = 6=#39c5cf
+palette = 7=#b1bac4
+palette = 8=#6e7681
+palette = 9=#ffa198
+palette = 10=#56d364
+palette = 11=#e3b341
+palette = 12=#79c0ff
+palette = 13=#d2a8ff
+palette = 14=#56d4dd
+palette = 15=#ffffff
+background = #0d1117
+foreground = #e6edf3
+cursor-color = #2f81f7
+cursor-text = #6fc1ff
+selection-background = #e6edf3
+selection-foreground = #0d1117