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/Oceanic Next

@@ -0,0 +1,22 @@
+palette = 0=#162c35
+palette = 1=#ec5f67
+palette = 2=#99c794
+palette = 3=#fac863
+palette = 4=#6699cc
+palette = 5=#c594c5
+palette = 6=#5fb3b3
+palette = 7=#ffffff
+palette = 8=#65737e
+palette = 9=#ec5f67
+palette = 10=#99c794
+palette = 11=#fac863
+palette = 12=#6699cc
+palette = 13=#c594c5
+palette = 14=#5fb3b3
+palette = 15=#ffffff
+background = #162c35
+foreground = #c0c5ce
+cursor-color = #c0c5ce
+cursor-text = #1b2b34
+selection-background = #4f5b66
+selection-foreground = #c0c5ce