chore(config): add .uid and recursive .import to gitignore

Godot 4.6 generates .uid files for script resources and .import files
in subdirectories. Both are editor-local and should not be tracked.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -6,7 +6,7 @@ server/target/
 client/.godot/
 client/export/
 client/reports/
-client/*.import
+client/**/*.import
 client/**/*.uid
 client/tooling/sprite_renderer/output/*.png