性能优化2，有待测试版本，修复编译bug

include/utils/spsc_queue.h

@@ -184,6 +184,19 @@ private:
     struct Cell {
         std::atomic<size_t> seq;
         T data;
+
+        Cell() : seq(0), data() {}
+        Cell(const Cell&) = delete;
+        Cell& operator=(const Cell&) = delete;
+        Cell(Cell&& other) noexcept
+            : seq(other.seq.load(std::memory_order_relaxed)), data(std::move(other.data)) {}
+        Cell& operator=(Cell&& other) noexcept {
+            if (this != &other) {
+                seq.store(other.seq.load(std::memory_order_relaxed), std::memory_order_relaxed);
+                data = std::move(other.data);
+            }
+            return *this;
+        }
     };
 
     // Lock-free bounded MPMC queue (Vyukov). We still expose it as SPSC in this project,