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透明背景签名生成测试
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✓ 字体 0: E:\phpProject\TEST\vat_api_se_client\public/test_transparent_signature/signature_font_0.png (7410 bytes, 600x200)
✓ 字体 1: E:\phpProject\TEST\vat_api_se_client\public/test_transparent_signature/signature_font_1.png (8523 bytes, 600x200)
✓ 字体 2: E:\phpProject\TEST\vat_api_se_client\public/test_transparent_signature/signature_font_2.png (6429 bytes, 600x200)
✓ 字体 3: E:\phpProject\TEST\vat_api_se_client\public/test_transparent_signature/signature_font_3.png (5665 bytes, 600x200)
✓ 字体 4: E:\phpProject\TEST\vat_api_se_client\public/test_transparent_signature/signature_font_4.png (11519 bytes, 600x200)
✓ 字体 5: E:\phpProject\TEST\vat_api_se_client\public/test_transparent_signature/signature_font_5.png (3493 bytes, 600x200)
✓ 字体 6: E:\phpProject\TEST\vat_api_se_client\public/test_transparent_signature/signature_font_6.png (6564 bytes, 600x200)

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全部测试通过！签名图片已生成透明背景。
请用图片查看器（支持透明通道的工具如 Photoshop、Chrome 等）检查效果。
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