1. 增加配置持久化

2. 完善细节

internal/config/config_other.go

@@ -0,0 +1,13 @@
+//go:build !windows
+
+package config
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func appDataDir() string {
+	home, _ := os.UserHomeDir()
+	return filepath.Join(home, ".config", "ffmpeg-gui")
+}