docs: add ReDoc URL to README

[ilysenko]

Adds the ReDoc URL alongside the Swagger UI URL in the README. FastAPI exposes ReDoc by default at /redoc; this just documents it.

Single-line README addition. No code changes.

[ilysenko]

Review Mate: merge recommended

🟢 Recommendation: merge recommended
Risk level: trivial

This looks safe to merge after the usual maintainer checks.

Automation: The bot did not merge because auto-merge is disabled for this project.

This PR documents FastAPI's default ReDoc route alongside the existing Swagger UI and healthcheck links. The change is README-only and does not affect the application runtime contract.

What changed

• README.md adds a ReDoc link under the local run instructions.

Why it matters

The touched file is documentation only, with no changes to API schemas, routers, storage, tests, packaging, or CI. No new tests are needed for this kind of change.

Notes for the reviewer

Local verification commands could not start in this read-only sandbox because the command runner failed before reading files; this judgment is based on the supplied PR diff.

References

• README.md:31

[ilysenko]

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