README: Fix Mermaid parse error in edge labels

[alanmaizon]

Some Mermaid renderers choke on parentheses/special chars in edge labels. This simplifies the two edge labels that were causing parse errors.

Summary by Sourcery

Documentation:

• Simplify Mermaid edge labels in the README flowchart to be compatible with more Mermaid renderers.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates README Mermaid diagram edge labels to avoid parse errors in some Mermaid renderers by simplifying problematic label text.

Flow diagram for updated README Mermaid edge labels

flowchart TB
  ALB -->|/*| FE
  ALB -->|/api/*| BE

  FE -->|fetch /api same origin| CF

  BE -->|SQL over TLS| RDS[(RDS Postgres)]
  BE -->|Objects| S3[S3 Uploads Bucket]
  BE -->|Secrets injection| SM[Secrets Manager<br/>DATABASE_URL]
  BE -->|LLM + Embeddings| BR[Amazon Bedrock<br/>Nova + Titan]

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File-Level Changes

Change	Details	Files
Simplified Mermaid flowchart edge labels in the README to remove characters that cause parse issues.	Updated frontend-to-cloud function edge label from including a parenthesized note about same-origin fetch to a simpler 'fetch /api same origin' text. Updated backend-to-database edge label from 'SQL (TLS)' to 'SQL over TLS' to avoid parentheses in the label.	README.md

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