Add Vercel deployment configuration

Revert Vercel deployment — restore Railway configuration

Force Python 3.12 for Vercel Python function

Pin Python to 3.12 for Vercel deployment

Fix Vercel function runtime config

Add Vercel full-stack deployment configuration

Improve PDF export formatting: spacing, font size, and margins

Add data reset endpoint and UI for clearing history/resume

Rename website field label to 'Vibe coding portfolio' and hyperlink in exports

Add README with setup, deploy, and project structure docs

Remove 'Area:' prefix from experience sub-headers in prompts

Fix apt package: libgdk-pixbuf2.0-0 renamed to libgdk-pixbuf-xlib-2.0-0

Fix Docker build: pin to python:3.11-slim-bookworm

Fix Railway deployment: use root Dockerfile via railway.toml

Add root Dockerfile for Railway auto-detection