Prepare Vercel-ready project landing page

[Huynhthuongg]

Summary by cubic

Prepares a polished, Vercel-ready project landing page and serverless entrypoint for the FastAPI app. Adds badges, deploy docs, safer output paths, and broader CI support, and bumps the app to v0.1.2.

• New Features

  • Vercel deployment: api/index.py ASGI entrypoint, vercel.json rewrites all routes to the app, and .vercelignore to trim builds.
  • Serverless-safe output: compiles write under UPCA_OUTPUT_BASE (default /tmp/upca) with strict relative output_dir validation in API and CLI.
  • Landing page: redesigned dashboard wired to /plan and /compile, plus README badges and a Deploy to Vercel guide.
  • CLI: added --dry-run to print the plan as JSON without writing files.

• Refactors

  • Centralized HTML in templates.py; root now serves the maintained template; version set to 0.1.2.
  • Tests cover the dashboard routes, Vercel config, and serverless output base; added scripts/check.sh.
  • CI runs on Python 3.10–3.12 and uses quiet pytest.
  • Added requirements.txt (fastapi, uvicorn, pydantic) and dev httpx2; set .python-version to 3.12.

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

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No issues found across 18 files

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