perf: ⚡ 优化平台自适应: 添加float/double自动选择和安全改进 #7
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- 新增 jsonb_number_t 根据平台自动选择类型 (32位用float, 64位用double) - API参数 double→jsonb_number_t, 向后兼容 - sprintf→snprintf 防止缓冲区溢出 - 添加 C89 snprintf 兼容层 - 支持手动 JSONB_USE_FLOAT/DOUBLE 覆盖 适用于嵌入式/单片机场景节省内存提升序列化效率，64位系统保持精度
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适用于嵌入式/单片机场景节省内存提升序列化效率，64位系统保持精度