Add decoupling cap fast path

[chriszlr]

Summary

• add a deterministic fast path for partitionType === "decoupling_caps" inside SingleInnerPartitionPackingSolver
• place decoupling capacitor partitions in a stable centered row using natural component ordering, rotation-aware widths, and decouplingCapsGap ?? chipGap spacing
• keep non-decoupling partitions on the existing PackSolver2 path
• pin circuit-to-svg@0.0.345 so the existing full Bun suite can load the schematic simulation SVG export

/claim #15

Verification

• bun test tests/PackInnerPartitionsSolver/SingleInnerPartitionPackingSolver.test.ts
• bun test
• bun x tsc --noEmit
• bun run format:check
• bun run build
• git diff --check

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