feat: refine logical vector index into an IVF view#6400
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Xuanwo
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BubbleCal
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This changes segmented vector index optimize so the default rebalance path keeps segment boundaries and rewrites only the single worst segment in each run. It builds on #6400's logical vector index / IVF view work and avoids the current behavior where segmented optimize treats the logical index as one physical index. I also added a regression test that creates a skewed two-segment IVF index and verifies that optimize replaces only the oversized segment while leaving the other segment untouched.
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This PR introduces
LogicalVectorIndexas a logical aggregate and moves IVF-specific partition inspection intoLogicalIvfView, so the API boundary matches the actual semantics.