Feature/plan minio support for s3

[aacruzgon]

•	New config knobs for S3-compatible endpoints:
•	endpoint_url, force_path_style, allow_http (with validation)
•	Runtime-safe backend init:
•	from_env_async() + sync wrapper without block_in_place
•	sensible defaults when endpoint_url is set (path-style + default region if needed)
•	Env-gated MinIO integration tests (testcontainers):
•	crates/persistence/tests/minio_s3_tests.rs
•	gated by RUN_MINIO_S3_TESTS=1
•	covers conditional create (if_none_match="*"), optimistic locking (if_match), vread/history, pagination (>1000), bulk export, bulk submit + rollback
•	Docs updates:
•	S3 docs + persistence README with endpoint-mode quick start and test commands

[codecov]

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