Prepare Vercel-ready project landing page

[Huynhthuongg]

Summary by cubic

Adds a Vercel-ready landing page and serverless entrypoint for the FastAPI app, with a polished dashboard at “/” that can plan and compile projects. Also routes compile output to a serverless-safe path, bumps to 0.1.2, and documents one-command deploy.

• New Features

  • Vercel support: api/index.py ASGI entrypoint and vercel.json rewriting all routes to it; output writes to UPCA_OUTPUT_BASE (Vercel sets /tmp/upca, local default .).
  • Dashboard redesign: served from / via INDEX_HTML; buttons call /plan and /compile; adds deploy guidance and GitHub badges; app/version set to 0.1.2.
  • Safety and CLI: enforce safe relative output_dir; add --dry-run and _safe_output_dir; shared checks between API and CLI.
  • DX: scripts/check.sh mirrors CI (Ruff + pytest); README adds badges and “Deploy to Vercel” steps; .vercelignore trims deploy size.
  • Tests: cover dashboard content/routes, output safety, Vercel config and entrypoint export, and serverless output base.

• Dependencies

  • Runtime: add requirements.txt with fastapi, uvicorn[standard], pydantic.
  • Dev/CI: add httpx2; expand CI to Python 3.10–3.12 with quiet pytest; add .python-version set to 3.12.

^{Written for commit 23fc831. Summary will update on new commits.}

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