fix: Replace hardcoded namespace "santhosh" with generic configurable values

[MayankJha0333]

Summary

Replaces hardcoded personal namespace santhosh with generic namespaces (kubeflow for KServe services, docs-agent for Milvus/app resources) to improve project portability.

Changes

• Updated server/app.py and server-https/app.py default URLs
• Updated pipeline milvus_host parameters in kubeflow-pipeline.py and incremental-pipeline.py
• Updated all Kubernetes manifests and deployment configs
• Revised documentation examples in README files

Fixes #18

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[haroon0x]

/lgtm @franciscojavierarceo

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