chore: remove exe files from repository and improve .gitignore

- Remove indus-terminal.exe and indus-gui.exe from git tracking
- Update .gitignore to exclude all .exe files and build artifacts
- Executables will be built by GitHub Actions on release

Author: hari7261

.gitignore

@@ -1,9 +1,12 @@
 # Binaries
-indus.exe
+*.exe
+indus
 dist/
+build/
 
 # Build artifacts
 cmd/indus-terminal/rsrc.syso
+*.syso
 
 # Test projects
 testproject/