Fix stats endpoint: filter vector query to level=2 memory records#1257

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SeeYangZhi wants to merge 9 commits intovolcengine:mainfrom

SeeYangZhi:fix/stats-memories-after-session-commit

Commits on Apr 6, 2026

Fix stats endpoint returning zero by using count() instead of query()
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Fix stats endpoint: use filesystem counting instead of vector index
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Commits on Apr 7, 2026

fix(stats): filter _query_all_memories by level=2 to exclude directory metadata
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refactor(stats): derive all memory stats from vector index level=2 query
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test(stats): update unit tests for vector-only stats aggregator
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fix(tests): restore MagicMock import for mock_ctx fixture
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fix(stats): remove order_by from level=2 query to avoid HNSW backend error
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fix(stats): skip non-matching records when category filter is applied
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test(stats): add regression test for category-filtered metrics
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