Add EverOS integration guide for Milvus

[zc277584121]

Summary

• Add a getting-started guide for using EverOS with Milvus Server.
• Cover installation, service configuration, conversation ingestion, Markdown inspection, hybrid search, and collection inspection.
• Explain how to switch the same setup to another Milvus Server endpoint or Zilliz Cloud.

Validation

• Ran the full workflow with EverOS 1.3.0, PyMilvus 3.0.1, and Milvus Server 2.6.22.
• Ingested ten sessions and verified that the two Atlas sessions ranked first and second with hybrid search.
• Checked all embedded Python blocks and Markdown formatting.

[jaelgu]

/lgtm

[jaelgu]

/approve

[sre-ci-robot]

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This pull-request has been approved by: jaelgu, zc277584121

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