Support filtering circuits by target_simulator__in

[pgetta]

What

Adds a target_simulator__in list filter to the Circuit API, so clients can filter circuits by multiple target simulators at once:

GET /circuit?target_simulator__in=NEURON&target_simulator__in=Brian2

This brings target_simulator to parity with the sibling enum fields scale and build_category, which already expose both single-value and __in filters. Ordering by target_simulator was added previously in #640.

Changes

• app/filters/circuit.py — add target_simulator__in: list[TargetSimulator] | None to CircuitFilterMixin. The __in operator is handled automatically by CustomFilter / fastapi-filter, so no service/router/factory wiring is needed. Shared via the mixin, so both CircuitFilter and NestedCircuitFilter pick it up.
• tests/test_circuit.py — add a target_simulator__in assertion to test_filtering.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
pytest	97.75% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
app/filters/circuit.py	100.00% <100.00%> (ø)

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[pgetta]

Thanks Gianluca!