feat: add .gitignore and update file paths

Add a .gitignore file to exclude target, private_repos, and log directories. Update TftpScore and HttpScore file paths in `main.rs` to use relative paths from the project root. Modify `HarmonyTUI` initialization in `lib.rs` to create log directory if it doesn't exist before setting the log file path.

harmony_tui/src/lib.rs

@@ -110,7 +110,8 @@ impl HarmonyTUI {
         tui_logger::init_logger(log::LevelFilter::Info).unwrap();
         // Set default level for unknown targets to Trace
         tui_logger::set_default_level(log::LevelFilter::Info);
-        tui_logger::set_log_file("harmony.log").unwrap();
+        std::fs::create_dir_all("log")?;
+        tui_logger::set_log_file("log/harmony.log").unwrap();
 
         color_eyre::install()?;
         let mut terminal = ratatui::init();