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/Flat

@@ -0,0 +1,22 @@
+palette = 0=#222d3f
+palette = 1=#a82320
+palette = 2=#32a548
+palette = 3=#e58d11
+palette = 4=#3167ac
+palette = 5=#781aa0
+palette = 6=#2c9370
+palette = 7=#b0b6ba
+palette = 8=#475262
+palette = 9=#d4312e
+palette = 10=#2d9440
+palette = 11=#e5be0c
+palette = 12=#3c7dd2
+palette = 13=#8230a7
+palette = 14=#35b387
+palette = 15=#e7eced
+background = #002240
+foreground = #2cc55d
+cursor-color = #e5be0c
+cursor-text = #ffffff
+selection-background = #792b9c
+selection-foreground = #ffffff