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/Purplepeter

@@ -0,0 +1,22 @@
+palette = 0=#0a0520
+palette = 1=#ff796d
+palette = 2=#99b481
+palette = 3=#efdfac
+palette = 4=#66d9ef
+palette = 5=#e78fcd
+palette = 6=#ba8cff
+palette = 7=#ffba81
+palette = 8=#504b63
+palette = 9=#f99f92
+palette = 10=#b4be8f
+palette = 11=#f2e9bf
+palette = 12=#79daed
+palette = 13=#ba91d4
+palette = 14=#a0a0d6
+palette = 15=#b9aed3
+background = #2a1a4a
+foreground = #ece7fa
+cursor-color = #c7c7c7
+cursor-text = #8c8c8c
+selection-background = #8689c2
+selection-foreground = #271c50