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issue: #51248 ## What changed - correct the omitted-`target_size` case to assert ordinary manual compaction semantics - add a physical Force Merge target-size case using persistent segment IDs and MinIO insert-log sizes - add deterministic Go boundary coverage for grouping selection at the configured threshold and threshold + 1 - add target-size memory clamp coverage for cluster and standalone co-location modes - extend Optimize format, signed-int64 boundary, loaded-segment refresh, and live async lifecycle coverage - add the async Optimize wrapper and update the PyMilvus test dependency to 3.1.0rc64 ## Why The previous cases did not prove that an explicit Force Merge target affected physical output, assumed the wrong grouping threshold, and depended on manual log inspection for algorithm selection. Loaded refresh and the public async Optimize workflow also lacked live end-to-end coverage. The async case exposed milvus-io/pymilvus#3680 on PyMilvus 3.1.0rc62. Version 3.1.0rc64 contains the tuple-unpacking fix and passes the unmodified test. ## Validation - all 10 planned case IDs pass; 0 failed and 0 blocked - `milvus-dev-cli` Go UT job `go-ut-local-zhuwenxi-zhuwenxing-i-4082040-30413568` succeeded; both test functions and all five subtests passed - physical target-size L3 case passed against a real cluster and MinIO in 200.68s - loaded refresh, target format/boundary, and manual compaction cases passed against the same server version - async Optimize L3 passed unmodified with PyMilvus 3.1.0rc64 in 56.91s - 56 Python nodes collect successfully; Python compilation, Ruff, and `git diff --check` pass --------- Signed-off-by: zhuwenxing <wenxing.zhu@zilliz.com>