chore: add golangci-lint v2 config and fix linter warnings (#46)

- [x] Add golangci-lint v2 configuration with formatters section
- [x] Reorganize linters-settings under linters section
- [x] Replace if-else chains with switch statements for clarity
- [x] Wrap all ignored error returns with `_ = ` pattern
- [x] Add OSC 8 hyperlink helper function for clickable ports
- [x] Add blank line in table styling function
- [x] Remove unnecessary type assertion in test

internal/config/watcher_test.go

@@ -423,7 +423,7 @@ func TestWatcher_HandleReload_LoadError(t *testing.T) {
 	defer watcher.Stop()
 
 	// Delete the config file to cause load error
-	os.Remove(configPath)
+	_ = os.Remove(configPath)
 
 	// Call handleReload directly
 	watcher.handleReload()