Add Altium project archive export

[imrishabh18]

Adds tsci export board.tsx --format altium and the same export for Circuit JSON inputs. The command writes an Altium project ZIP containing .PcbDoc, .SchDoc, and .PrjPcb files, defaults to <input-basename>-altium.zip, and supports --output through the existing export pipeline.

Uses tscircuit/circuit-json-to-altium pinned to commit 5bdb7d235ef896ddf9ac5c4f315c4d0ce07fdfb5 because the package is not yet on npm. Overrides the transitive Git dependency with the published altiumts@0.0.59 distribution, so clean installs do not depend on a Git prepare script, and raises the Circuit JSON minimum/override to 0.0.480, which adds the outline keepout schema required by the converter.

Validation:

• Altium TSX and Circuit JSON/custom-output integration tests pass; archive contents and native PCB/schematic signatures are checked.
• Existing KiCad export regression tests pass (6 tests total).
• bunx tsc --noEmit, bun run build, and formatting checks for changed TypeScript files pass.
• Built CLI exports an Altium archive under Node.js.

[tscircuitbot]

---

Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

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

---