Add slotted fuse-clip footprint

[Abse2001]

Summary

• add a fuseclip footprint family for two plated slots
• parameterize the verified pitch, slot size, and outer plating size
• add a C3130 regression test and SVG snapshot

Motivation

The 5x20 fuse clip represented by JLCPCB C3130 uses two rotated plated slots. Existing circular-hole connector families cannot reproduce that copper and drill geometry; the best match reached 86.14% copper IoU.

Implementation

fuseclip generates two 90-degree pill-shaped plated holes. Its parameters correspond directly to the measured pitch, hole width/height, and outer width/height of the real footprint.

Validation

• bun test tests/fuseclip.test.ts: 1 passed
• bun run build
• C3130 copper IoU: 100.00%
• new SVG snapshot showing the two plated slots