给特征值求解器核心向量运算补上 OpenMP 多线程并行化#373
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math_kernel_op_vec.cpp 里几个向量运算的 OpenMP 还用的是裸 #pragma omp parallel for， 项目里 memory_op 早换成 OMP_PARALLEL+BLOCK_TASK_DIST_1D 了，顺手统一了一下。 Davidson 里两段 O(n^2) 的矩阵拷贝循环也补了并行化。 diago_cg.cpp 加了 tool_threading.h 以备后续使用。
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