fix(api): audit done task archives

[Vann-Dev]

Summary

• Record a company-scoped audit log when the project bulk archive-done endpoint runs.
• Include safe project target metadata, user actor metadata, and archived task count only.
• Preserve the existing archive response shape and auth/company scoping.

Checks

• PASS: corepack pnpm lint
• PASS: DATABASE_URL=postgresql://user:pass@localhost:5432/db?schema=public AUTH_SECRET=placeholder corepack pnpm typecheck
• FAIL: DATABASE_URL=postgresql://user:pass@localhost:5432/db?schema=public AUTH_SECRET=placeholder corepack pnpm build — ENOSPC while creating .next/standalone node_modules after compilation/static page generation.