Add jlcpcb cad model support to eval

[techmannih]

What changed

• add cadModel extraction to the default jlcpcb footprint resolver in getPlatformConfig
• keep the existing render regression for jlcpcb: footprints and make it deterministic with a local C156301 fixture
• add a dedicated resolver-level regression that verifies jlcpcb returns both footprintCircuitJson and extracted cadModel
• add a committed C156301 circuit-json fixture for the tests

Why

kicad: and jlcpcb: both go through the generic lib:name footprint loading path in core, but they were not symmetric in eval.

For kicad:, the resolver already returned both:

• footprintCircuitJson
• explicit cadModel

For jlcpcb:, the resolver only returned footprintCircuitJson, even when the fetched circuit-json already contained embedded cad_component metadata. That meant PCB rendering worked, but jlcpcb: did not match the kicad: behavior for 3D model handoff.

Now that core has merged support for extracting CAD from library footprints, eval still needs to provide the same explicit resolver-level behavior as kicad: so the default platform config is complete and consistent.

Why this is needed in eval

eval is where the default platform wiring lives. This change makes the built-in jlcpcb footprint loader behave like the built-in kicad loader:

• fetch footprint data
• return footprintCircuitJson
• return cadModel

The main difference is just the source of the CAD metadata:

• kicad: constructs CAD URLs directly from the KiCad cache URL pattern
• jlcpcb: extracts CAD metadata from the fetched EasyEDA-derived circuit-json

Test notes

The render and CAD tests use a committed C156301 circuit-json fixture instead of a live network fetch.

That is intentional so the tests stay deterministic and do not depend on EasyEDA availability or proxy behavior during CI. The part number and the payload are aligned to the same C156301 fixture.

Validation

• bun test ./tests/features/jlcpcb-footprint-library-map.test.tsx ./tests/features/jlcpcb-footprint-library-map-cadmodel.test.tsx
• bunx tsc --noEmit

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[seveibar]

See comment

[seveibar]

Never introduce a utils directory. Directory names should be domain specific and domain organized. Eg lib/getPlatformConfig/extractCadModelFromCircuitJson

[seveibar]

See comment

[tscircuitbot]

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