style: format code and modernize loop syntax

- Align struct fields and constants in gjson/config.go
- Add missing newline at EOF in gjson/decode.go
- Remove trailing blank line in gjson/encode.go
- Remove extra blank line in internal/lua/coroutine.go
- Use modern for range syntax in internal/lua/pool.go

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

gjson/encode.go

@@ -267,4 +267,3 @@ func formatNumber(n float64, precision int) string {
 	// Use 'g' format for floating point
 	return strconv.FormatFloat(n, 'g', precision, 64)
 }
-

internal/lua/coroutine.go

@@ -368,7 +368,6 @@ func (c *LuaCoroutine) executeProto(proto *glua.FunctionProto) error {
 	fn := c.Co.NewFunctionFromProto(proto)
 	c.Co.Push(fn)
 	err := c.Co.PCall(0, 0, nil)
-
 	if err != nil {
 		atomic.AddUint64(&c.Engine.stats.ScriptsErrors, 1)
 		return fmt.Errorf("lua execution error: %w", err)

internal/lua/pool.go

@@ -50,7 +50,7 @@ func NewLStatePool(factory func() *glua.LState, initialSize, maxSize int) *LStat
 	}
 
 	// 预热：预先创建 initialSize 个 LState
-	for i := 0; i < initialSize; i++ {
+	for range initialSize {
 		L := p.factory()
 		p.pool = append(p.pool, L)
 		p.current++