README: Fix Mermaid architecture diagram

[alanmaizon]

Fix a Mermaid parse error in the README deployed-architecture diagram (broken RDS node syntax).

Summary by Sourcery

Documentation:

• Correct Mermaid syntax for the deployed architecture diagram in the README so it renders properly.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Fixes the Mermaid deployed-architecture diagram in README so it parses correctly by adjusting an edge label and correcting RDS/S3 node syntax.

File-Level Changes

Change	Details	Files
Correct Mermaid edge label formatting and node declaration so the architecture diagram renders without parse errors.	Change the FE-to-CF edge label text from 'same origin' to 'same-origin' to avoid Mermaid parsing issues with the label contents. Update the S3 node from the double-parentheses style to square brackets so it matches valid Mermaid node syntax for this diagram and avoids the prior RDS parse error.	README.md

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