fix: exclude binaries from npm package

- Add bin/doplan and bin/doplan.exe to .npmignore
- Binaries should be downloaded, not included in package
- Reduces package size from 8MB to ~5KB

Author: iDorgham

.npmignore

@@ -13,9 +13,14 @@ scripts/build.bat
 dist/
 *.exe
 doplan
+doplan.exe
 coverage.out
 coverage.html
 
+# Exclude binaries from bin directory (they should be downloaded)
+bin/doplan
+bin/doplan.exe
+
 # Documentation (keep only essential)
 *.md
 !README.md