fix(message-history): scope result snapshots to operator

[btlqql]

Summary

• scope stored message-query result lookup to the authenticated operator
• return the existing not-found response when a record belongs to another operator
• add regression coverage for owned and cross-operator result access

Why

History list and summary queries already filter on queried_by, but the result snapshot endpoint previously loaded records by primary key alone. A signed-in user who learned another record ID could therefore retrieve that operator's stored message metadata.

Testing

• mvn -Dmaven.repo.local=D:\taiyi-maven-cache -Dtest=QueryHistoryServiceTest test (passes)
• Full server suite was attempted on Windows: 2037 tests ran; unrelated existing CLI-agent shell assumptions and AliyunInstanceProviderTest.getGroupProgressShouldMapLagRowsTest failed.

[RockteMQ-AI]

Summary

Fixes an authorization issue where any authenticated user could access another user's query result snapshots by ID. Now properly scopes getMessageQueryResults to the authenticated operator via queried_by filter.

Security fix with proper test coverage for both the authorized and unauthorized access paths.

LGTM.

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