Use jlcMinTolerances values for DRC defaults

[imrishabh18]

Motivation

• Align local DRC default values with the published JLCPCB minimum manufacturing tolerances so checks use the manufacturer minimums rather than hardcoded values.

Description

• Add @tscircuit/jlcpcb-manufacturing-specs to devDependencies pinned to commit fa54ff1f9eabca1b852a0b035db907061e5c4a2f in package.json.
• Import jlcMinTolerances from @tscircuit/jlcpcb-manufacturing-specs in lib/drc-defaults.ts and use its fields as the source for DRC minimums.
• Replace hardcoded defaults with expressions that prefer jlcMinTolerances values and fall back to the previous numeric constants where the package does not supply a value.
• Preserve unrelated constants like DEFAULT_VIA_BOARD_MARGIN and EPSILON unchanged.

Testing

• Ran bun run format, which completed but reported existing large-file warnings for JSON fixtures; formatting run finished (warnings only).
• Performed npm install (git dependency resolved) and npm run build, and the build completed successfully.

---

Codex Task

[tscircuitbot]

---

Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

Track your contributions and see the leaderboard at: tscircuit Contribution Tracker

---