v.0.1.0: Add setup docs, AGPL license, and major documentation updates

Added SETUP.md for local development instructions, LICENSE.md with AGPL-3.0 license, and .env.example for Firebase configuration. Updated README.md with detailed project overview, features, setup, and contribution guidelines. Improved .gitignore to allow .env.example. Expanded CLAUDE.md with technical guide details. Various minor updates to source files and documentation for clarity and onboarding.