[MugdhoAI]

Summary

• Add CI and CodeQL badges so repository health is visible immediately.
• Clarify the project's purpose, intended learning scope, and non-production status.
• Put a Docker Compose quickstart near the top of the README.
• Add a Mermaid architecture diagram showing authentication, owner-scoped database access, encryption, and audit metadata.
• Correct the project tree to include migrations, key-rotation tooling, workflows, and repository guidance files.

Verification

• Checked the documented Docker Compose command, route names, encryption flow, and file inventory against the current repository.
• Documentation-only change; no application behavior changes.

Scope

No hosted demo or performance comparison is added: the service handles sensitive values, and a meaningful performance comparison would require a controlled deployment and workload.