fix: truncate question input to 500 characters for embedding generation

feat: implement rate limiting for chat and document API endpoints

feat: implement server token verification for secure API access and remove rate limiting functionality

refactor: enhance FastAPI initialization with explicit URL configurations

fix: correct argument order in get_document_text call for chunk context retrieval

refactor: update database connection handling and dependency injection for PostgreSQL and Qdrant

refactor: remove unused DB_PATH configuration from config and postgres modules

feat: recreate Dockerfile and requirements.txt for application setup

init

initial commit