[Improvement] catalog supports tenant data isolation

### What would you like to be improved?

Unified metadata management implements data isolation between users and tenants based on the enterprise user system and implements multi-source converged analysis across tenants;

### How should we improve?

_No response_

The issue names no files, tests, or entry points and provides no acceptance criteria. Start by locating catalog metadata ownership and the enterprise user or tenant authorization model, then clarify the isolation and cross-tenant analysis requirements before implementation; done requires an agreed scope and corresponding tests.

Written by the indexing model from the issue text.