DEPS: cirq, pennylane, qiskit-aer are unused core dependencies

[Manideep3969]

Issue

pyproject.toml lists cirq>=1.3, pennylane>=0.34, and qiskit-aer>=0.14 as core dependencies but none are imported in any source file. This bloats the install and may cause version conflicts.

Fix

Move to optional dependencies under [project.optional-dependencies]:

[project.optional-dependencies]
frameworks = ["cirq>=1.3", "pennylane>=0.34"]
simulator = ["qiskit-aer>=0.14"]