parser

type FieldInfo struct {
	Name       string
	Type       reflect.Type
	Tag        *TagSpec
	Index      []int // Field index path for embedded structs
	IsEmbedded bool
	FieldName  string // Original struct field name
}

type StructInfo struct {
	Fields []FieldInfo
}

type TagSpec struct {
	// Source configuration
	EnvVar   string // Environment variable name
	FileKey  string // Key in config file (for nested configs)
	Default  string // Default value if not found
	Required bool   // Is this field required?
	Prefix   string // Prefix for nested structs (e.g. "DB_")

	// Type conversion
	Separator string // For slices: "1,2,3" with separator ","
	Format    string // For time.Time: "2006-01-02"

	// Validation rules
	Validators []Validator
}

type Validator struct {
	Name   string   // "min", "max", "email", "url"
	Params []string // Parameters for validator
}