【代码贡献】新增 Grover 量子计数算法 - #74
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概要
本提交为 #13 的代码贡献类参赛条目，补齐仓库中 Grover 振幅放大与 QAE 之间缺失的 Quantum Counting（量子计数）算法。
主要内容
QCount.QuantumCount：对 Grover 振幅放大算子执行相位估计，在未知解数量时估计标记态数量。Grover.amp_operator，保持 oracle / zero-reflection 语义与仓库已有 Grover、QAE 实现一致。QuantumCountResult，返回估计标记态数量/比例、测量相位、bitstring、概率与 shots。phase_to_count/count_from_bitstring后处理 API，正确处理 Grover 共轭特征相位phi与1-phi。pyqpanda_alg包，并加入 focused regression source。按当前仓库结构，
Grover.amp_operator()文档已明确列出 Quantum Count 为振幅放大的消费者，但此前没有对应模块；此提交补齐该算法层。未运行额外测试/验证矩阵；本提交直接提交实现与回归源文件。
相关：#13