v1.3.1 — remove Langfuse v3 (broken S3 event pipeline with HybridS3) Langfuse v3 requires S3 ListObjectsV2 which fails against HybridS3 due to JS AWS SDK v3 signing the canonical URI without the endpoint path prefix. Removes all Langfuse services, config, nginx routing, env vars, and HybridS3 bucket.