docs: add numbered flow diagram to README

chore: reorganize project structure for better maintainability

docs: highlight unique value propositions and improve documentation organization

fix(auth): Fix user authentication and conversation ownership

fix(security): Remove demo credentials from login page

# feat(frontend): Enhance S3/CloudFront deployment with security improvements and documentation

chore: improve project security and documentation

chore: remove sensitive files from Git tracking and add example templates

chore: remove sensitive files from Git tracking and add example templates

# feat(auth): Implement JWT authentication with Lambda authorizer for AppSync

docs: improve architecture documentation and diagrams

fix: Add comprehensive null checks to prevent "msg.id is undefined" errors

refactor: remove unused Bedrock Client Lambda

docs: fix README.md discrepancies with actual implementation

docs: enhance DynamoDB schema documentation in README