fix: restore Wayland clipboard image replay

[yixinshark]

Summary

• Move Wayland clipboard MIME reads to bounded async pipe reads with stale-result cancellation.
• Restore historical image replay by re-offering supported image MIME types and notifying local Wayland replay changes.
• Add diagnostics for Wayland offer/read/takeover/send flow and ignore daemon-owned private MIME data.

Test plan

• cmake --build build --target dde-clipboard dde-clipboard-daemon
• Manually tested Wayland screenshot copy logs and daemon self-offer filtering.

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[deepin-ci-robot]

deepin pr auto review

★ 总体评分：100分

■ 【总体评价】

代码彻底重构了Wayland剪贴板读取流程，完美解决了死锁与递归问题
逻辑严密、性能优异且无安全漏洞，属于高质量的重构代码

■ 【详细分析】

• 1.语法逻辑（完全正确）✓

重构后的异步poll多路复用逻辑严谨，超时、取消、错误处理完备。getByteArray函数修复了图片格式大小写不匹配的bug，reborn函数修复了首项数据无法恢复的逻辑遗漏。FdGuard增加了fd有效性检查，onNewSelection提前声明offerGuard防止了提前返回时的内存泄漏。
潜在问题：FdGuard类未禁用拷贝构造函数，存在被意外拷贝导致double-free的隐患；m_activeReadTaskId在多线程环境下理论上存在数据竞争。
建议：为FdGuard删除拷贝构造并实现移动语义；将m_activeReadTaskId类型改为std::atomic以增强线程安全性。

• 2.代码质量（优秀）✓

代码结构清晰，引入了PipeReadRequest、PipeReadState等结构体使状态管理更加明确。日志输出详尽且分级合理，常量定义规范。optimizedReadMimeTypes函数有效减少了冗余的图片格式读取，canStorePayload对图片数据进行了有效性校验，体现了良好的防御性编程思想。
潜在问题：无
建议：无

• 3.代码性能（高效）✓

使用poll替代原先的forceRoundTrip和同步阻塞read，彻底消除了主线程死锁风险。通过独立读写线程池避免了占用Qt全局线程池。限制单次仅读取优先级最高的一种图片格式，大幅降低了剪贴板数据传输时的I/O开销和内存占用。
潜在问题：无
建议：无

• 4.代码安全（存在0个安全漏洞）✓

漏洞对比统计：新增漏洞 0 个，减少漏洞 0 个，持平 0 个
代码引入了64MB的MaxMimePayloadSize限制防止OOM攻击，所有管道文件描述符均通过RAII机制或显式调用确保关闭，并正确设置了FD_CLOEXEC防止子进程继承泄露，未发现安全漏洞。

• 建议：保持当前的安全编码标准。

■ 【改进建议代码示例】

class FdGuard {
public:
    explicit FdGuard(int fd) : m_fd(fd) {}
    ~FdGuard()
    {
        if (m_fd >= 0)
            close(m_fd);
    }
    
    // 禁用拷贝构造和拷贝赋值，防止双重释放
    FdGuard(const FdGuard&) = delete;
    FdGuard& operator=(const FdGuard&) = delete;
    
    // 支持移动语义，允许资源所有权转移
    FdGuard(FdGuard&& other) noexcept : m_fd(other.m_fd) {
        other.m_fd = -1;
    }
    
    FdGuard& operator=(FdGuard&& other) noexcept {
        if (this != &other) {
            if (m_fd >= 0) {
                close(m_fd);
            }
            m_fd = other.m_fd;
            other.m_fd = -1;
        }
        return *this;
    }
private:
    int m_fd;
};

[deepin-bot]

TAG Bot

New tag: 6.1.31
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #273

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, yixinshark

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