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/C64

@@ -0,0 +1,22 @@
+palette = 0=#090300
+palette = 1=#a2524c
+palette = 2=#55a049
+palette = 3=#bfce72
+palette = 4=#6657b3
+palette = 5=#984ca3
+palette = 6=#67b6bd
+palette = 7=#ffffff
+palette = 8=#000000
+palette = 9=#a2524c
+palette = 10=#55a049
+palette = 11=#bfce72
+palette = 12=#6657b3
+palette = 13=#984ca3
+palette = 14=#67b6bd
+palette = 15=#f7f7f7
+background = #40318d
+foreground = #7869c4
+cursor-color = #7869c4
+cursor-text = #40318d
+selection-background = #7869c4
+selection-foreground = #40318d