Make LSMVectorIndex ID property configurable

[Copilot]

The SQLFunctionVectorNeighbors function hardcoded WHERE name = ? when querying vertices by ID, which fails for vertex types using a different identifier property.

Changes

LSMVectorIndexBuilder

• Added idPropertyName field (defaults to "id")
• Added withIdProperty(String) method and JSON metadata support
• Documented required vs optional metadata keys

LSMVectorIndex

• Added idPropertyName field, persisted in metadata JSON
• Added getIdPropertyName() getter

SQLFunctionVectorNeighbors

• Changed query to use configured ID property instead of hardcoded "name"

// Before: hardcoded "name"
"SELECT " + vectorProperty + " FROM " + typeName + " WHERE name = ? LIMIT 1"

// After: configurable via index metadata
"SELECT " + vectorProperty + " FROM " + typeName + " WHERE " + idProperty + " = ? LIMIT 1"

Usage

// Programmatic
database.getSchema()
    .buildLSMVectorIndex("VectorDoc", new String[] { "embedding" })
    .withIdProperty("customId")  // Configure ID property
    .create();

// Via metadata JSON
CREATE INDEX ON VectorDoc (embedding) LSM_VECTOR 
METADATA {
  "dimensions": 1024,
  "idPropertyName": "customId"
}

Backward compatible: defaults to "id" when not specified.

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