feat(infra): add AWS Terraform codebase for ECS Fargate deployment

docs: refactor mcp architecture to use stdio for cloud-native deployment

docs: clarify final routing in mcp execution flow

docs: clarify embedding step in mcp execution flow

docs: quote mermaid diagram labels to fix parse error

docs: update mcp design diagram and remove code blocks

docs: add mcp gateway design document

docs: add RAGBase enterprise agent design and eval system

chore: fix volume permissions and update deployment plan

fix: address all security audit findings

ci: pin black version to 25.12.0 for consistent formatting

refactor: consolidate docker-compose files into single docker-compose.yml

chore: add all latest updates (Docker, frontend, docs, run script)

docs: add security audit report

docs: update system architecture and executive summary with diagrams