Reorganized README sections, adding project overview and implementation guides for better navigation. Added `.gitignore` entry to exclude `node_modules`. Updated `pnpm-lock.yaml` with new dependencies for authentication, database, and real-time communication modules.
Introduced a "Documentation" section in the README with links to various detailed implementation plans (e.g., backend architecture and OAuth integration). Updated the license from MIT to AGPLv3 to align with project compliance.
