refactor: bashrc is always sourced after tool install automatically

- Added source_bashrc funciton in shell_confi.sh
- Removed bashrc source commands from installer scripts
- Updated skill instructions

installers/install_bat.sh

@@ -94,7 +94,6 @@ main() {
 
     echo
     log_success "Bat installation and configuration complete."
-    log_info "Please close and reopen your terminal or run: source ~/.bashrc to apply changes."
 }
 
 main "$@"