pdf2skills 1.0

fix: Railway config - use uvicorn, correct runtime.txt

fix: add runtime.txt for Python version

fix: add nixpacks.toml for Railway Python build

fix: add start.sh and railway.toml for Railway

fix: update Railway config to use hypercorn

fix: add Railway deployment config (railway.json + Procfile)

feat: support multiple LLM providers (MiniMax, DeepSeek, GLM, Qwen, Moonshot)

feat: complete PDF2Skills application