New pattern submission

## GitHub PR for template:

#3055

**Pattern:** s3-vectors-lambda-bedrock-cdk
**Description:** Serverless RAG pipeline using S3 Vectors for vector storage, Lambda for orchestration, Bedrock Titan for embeddings and Claude for generation.
**Language:** TypeScript
**Framework:** AWS CDK
**Services:** Amazon S3 Vectors, AWS Lambda, Amazon Bedrock (Titan Embeddings V2, Claude)