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* feat(storage): support S3-compatible endpoints (R2, MinIO, B2) for file storage Add S3_ENDPOINT and S3_FORCE_PATH_STYLE env vars, wired into the shared upload S3 client so Cloudflare R2, MinIO, Backblaze B2, and other S3-compatible stores work for self-hosted file storage. The endpoint is trusted operator config (no SSRF/HTTPS gate). Makes the multipart Location fallback endpoint-aware, extends the S3 client unit tests, and documents the new vars in Helm values, .env.example, and the English self-hosting docs (incl. browser-reachability + CORS guidance). * docs(storage): add RustFS as an S3-compatible provider example * fix(storage): address review feedback and fix env mock for CI - Add envBoolean to the shared env test mock (createEnvMock) so config.ts's forcePathStyle coercion resolves — fixes failing knowledge/utils.test.ts - Declare S3_FORCE_PATH_STYLE as z.string() (every other env var's pattern); it's coerced via envBoolean at the consumption site, avoiding a boolean type that never matches the string process.env value - Log path-style from S3_CONFIG.forcePathStyle (envBoolean) instead of a separate isTruthy call, so the startup log can't disagree with the client - Make buildObjectFallbackUrl honor forcePathStyle: virtual-hosted-style URL (bucket as subdomain) for R2, path-style only when forcePathStyle is set * docs(storage): add backlinks to S3-compatible providers (R2, MinIO, Ceph, B2, RustFS) and backends