⚡ Bolt: Remove N+1 pagination loop in KnowledgebaseService

[nkissick-del]

💡 What:
Removed the manual offset/limit loop in KnowledgebaseService.get_all_kb_by_tenant_ids.
Fixed a bug where order_by result was ignored (Peewee order_by is not in-place).
Added a regression test test/unit_test/services/test_knowledgebase_perf.py.

🎯 Why:
The original code fetched knowledge bases in batches of 50 using offset. This is inefficient for large datasets (O(N^2) complexity for scanning offset) and causes multiple database round-trips. It was also marked with a # optimize later comment.

📊 Impact:
Significantly reduces database queries for tenants with many knowledge bases. Reduces from ceil(N/50) queries to 1 query.

🔬 Measurement:
Verified with test/unit_test/services/test_knowledgebase_perf.py which mocks the DB interface and asserts that offset and limit are not called, while dicts() is called on the sorted query.

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PR created automatically by Jules for task 15047153084982131651 started by @nkissick-del

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