Expand README with deployment architecture and services

[jeffmaki]

Added detailed deployment architecture and services information to README.

Summary

Expanded README.md with:

• A deployment architecture diagram covering backend, Rails, cgimap, worker, and Azure Postgres.
• Detailed descriptions of container responsibilities and database connectivity.
• Clarification of the two-database model and Alembic migration order.
• Documentation of environment templating conventions and injected secrets.
• A local development backend URL: http://localhost:8000.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c78c4cc9-3f6e-4608-ad31-992582be944a

📥 Commits

Reviewing files that changed from the base of the PR and between 5b1127e and 730d488.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README.md now documents deployment architecture, service roles, database separation and migrations, environment templating, and local backend access.

Changes

Deployment documentation

Layer / File(s)	Summary
Architecture and setup documentation README.md	Documents container connectivity, service database usage, the two Alembic migration trees, environment-based configuration, injected secrets, and the local backend URL.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: susrisha

Poem

I’m a rabbit with docs in my paws,
Mapping services and database laws.
Two migration trails hop into view,
Environment secrets are templated too.
And localhost welcomes the crew!

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