[enhance](struct) Merge struct_element into element_at#64027

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csun5285:fix/DORIS-26105-struct-subscript-coredump

Commits on Jun 3, 2026

[fix](function) make element_at support struct, drop struct_element

csun5285
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claude
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[fix](struct) match struct field name case-insensitively

csun5285
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claude
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Commits on Jun 4, 2026

[fix](element_at) keep map[null] null-key lookup, still fold null container

csun5285
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claude
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