【代码贡献】新增 Hadamard Test 复期望值估计模块

[tokenjunkielabs]

关联 #13（2026 本源杯开源创新赛道｜代码贡献）。

Adds a reusable pyqpanda_alg.HadamardTest module for estimating the full complex overlap ⟨ψ|U|ψ⟩ with one ancilla:

• real component through the ancilla X basis;
• imaginary component through the ancilla Y basis;
• caller-supplied PyQPanda3 state-preparation and controllable-unitary circuit builders;
• explicit q0-first data-register convention with a separate ancilla;
• independent NumPy reference_expectation for exact state-vector comparison and input-contract checks;
• public package export, runnable RX/|+⟩ example, and focused regression source.

For the example, |ψ⟩=|+⟩ and U=RX(θ), so the reference value is exp(-iθ/2), exercising both real and imaginary components.

Branch is based on sponsor develop@5f973efccb84bc193157d1ccebe32137e307293b; delivered fork head is e4caadd2dbd1add0ec0a6f058d923601c5bec473. Per the current owner execution directive, no test/verification run was performed and none is claimed. Maintainer CI/review remains authoritative.

Prepared with AI assistance for TokenJunkieLabs under @woahwhattheheck. Opening this PR makes no merge, prize, award, or payment claim.