【代码贡献】新增QPE量子相位估计算法 - #34
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新增 QPE（量子相位估计）模块
量子相位估计是量子计算的基础算法，是 HHL、QAE、Shor 等算法的核心子程序。
新增内容
pyqpanda_alg/QPE/qpe.py — QPE 主类，支持：
任意酉算子 U 的相位估计
可配置计数 qubit 数（精度控制）
自定义本征态制备电路
Statevector 模式（shots=-1）和采样模式（shots>0）
run_dict() 返回完整概率分布
test/QPE/Test_qpe.py — 7 个 pytest 用例
test/10-VQE/demo03-qpe-basic.ipynb — Z 门基础演示
test/10-VQE/demo04-qpe-advanced.ipynb — 旋转门 + 精度对比