Final Fix: Standardize on port 7860 and explicitly trust Space domain for perfect success

Refactor: Achieve Perfect Deployment by standardizing on port 7860 and hardening security

Fix: Add Hugging Face domains to ALLOWED_HOSTS and CSRF_TRUSTED_ORIGINS

Fix: Specify app_port 8000 for Hugging Face Space

Refactor: Exclude PDF and CSV files from Git to fix HF push error

initial commit