Replace System.out.println with LogManager in LSMVectorIndex

[Copilot]

What does this PR do?

Replaces direct console output with proper logging infrastructure in LSMVectorIndex.loadVectorsFromPages().

Motivation

Addresses code review feedback from #2911. Direct use of System.out.println in library code bypasses log level controls and output routing. The codebase uses LogManager consistently elsewhere.

Related issues

• Parent PR: perf: improved compression with lsm vectors #2911

Additional Notes

Changed from string concatenation to format specifiers for cleaner logging:

// Before
System.out.println("loadVectorsFromPages DONE: Loaded " + vectorIndex.size() + " vector locations (" + entriesRead
    + " total entries) for index: " + indexName + ", nextId=" + nextId.get() + "...");

// After  
LogManager.instance().log(this, Level.INFO, "loadVectorsFromPages DONE: Loaded %d vector locations (%d total entries) for index: %s, nextId=%d, fileId=%d, totalPages=%d%s",
    vectorIndex.size(), entriesRead, indexName, nextId.get(), getFileId(), getTotalPages(), ...);

Checklist

• I have run the build using mvn clean package command
• My unit tests cover both failure and success scenarios

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