Character Generation tool updated with .env config, API endpoints, database, and new agents

The Character Generation tool has been updated with a host of new features and quality‑of‑life improvements. The update introduces a configurable .env file, API endpoints for Ollama, OpenAI, Anthropic, and Gemini, and a lightweight database that persists generated books, characters, and images. Users can now save character details, view them in a swipeable gallery, and generate prompts directly from the UI. The tool now supports EPUB and plain text input, integrates Gemini image generation, and offers collapsible sidebars, a task‑manager widget, and a debug panel. A new Locations tab lets users extract building and landscape descriptions from a book, configure time of day, weather, genre, and decade, and generate wide architectural prompts that feed straight to Gemini or ComfyUI. Two new agents—Group Scene Finder and Batch Image Generation—allow multi‑character scene prompts and sequential image creation with seed randomization. An Abort button was added to both agents for graceful cancellation. The underlying tech stack now includes FastAPI, LangChain, ChromaDB, HuggingFace, and a React front‑end.