docs: document source-backed API behavior

[jonathanperis]

Summary

• Audited README and Astro Pages wiki against the current Rust API, SQL dump, Docker Compose, docs tooling, and workflows.
• Documented previously implicit source-backed behavior: PascalCase DTO aliases, seeded client limits, over-limit debit handling, and local InfluxDB/Grafana env requirements.
• Extended the docs drift guard so those source-backed facts stay covered by CI.

Audit findings addressed

• The API accepts both lowercase challenge fields and PascalCase aliases (Valor, Tipo, Descricao), but docs only described lowercase fields.
• The five seeded client limits are present in both Rust and SQL but were not documented in the API contract.
• The stored procedure currently returns unchanged balance with a 200 response for over-limit debits rather than documenting that behavior explicitly.
• Local k6/observability needs .env values for INFLUXDB_PASSWORD and INFLUXDB_TOKEN, but quick-start stress-test docs skipped that setup.
• docs/README.md did not mention the Astro 6/Sätteri/Bun/Node runtime shape.

Validation

• python3 scripts/check_docs_drift.py
• cd docs && bun run lint
• cd docs && bun run build
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 797b4a89-bfcb-48aa-a55c-cb18f99cbddf

📥 Commits

Reviewing files that changed from the base of the PR and between 6dc3805 and 2ba6404.

📒 Files selected for processing (6)

• README.md
• docs/README.md
• docs/wiki/architecture.md
• docs/wiki/getting-started.md
• docs/wiki/performance.md
• scripts/check_docs_drift.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/source-backed-audit-updates

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