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/Fish Tank

@@ -0,0 +1,22 @@
+palette = 0=#03073c
+palette = 1=#c6004a
+palette = 2=#acf157
+palette = 3=#fecd5e
+palette = 4=#525fb8
+palette = 5=#986f82
+palette = 6=#968763
+palette = 7=#ecf0fc
+palette = 8=#6c5b30
+palette = 9=#da4b8a
+palette = 10=#dbffa9
+palette = 11=#fee6a9
+palette = 12=#b2befa
+palette = 13=#fda5cd
+palette = 14=#a5bd86
+palette = 15=#f6ffec
+background = #232537
+foreground = #ecf0fe
+cursor-color = #fecd5e
+cursor-text = #232537
+selection-background = #fcf7e9
+selection-foreground = #232537