UX Polish, Metadata Embedding & Local Name Generation

feat: add Docker configuration for Hugging Face Spaces deployment

refactor: modularize codebase and reorganize utilities

style: reorganize UI into tabs and refine button hierarchy

feat: integrate Ollama for local prompt refinement

docs: Update design and readme to reflect ComfyUI integration and .env config

docs: Update README and design doc with Gemini and Save/Load features

Initial commit: RPGPortrait Prompt Builder