fix(spi): guard empty UPDATE SET clause, quote-aware now() replacement, null-safe DBStructUtils - #2335
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…t, null-safe DBStructUtils (code review follow-up)
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Fixes verified review findings tracked in #2281: (1) getUpdateSql with all columns unchanged produced 'UPDATE t SET WHERE ...' (deleteCharAt eating into SET) — now returns empty; (2) updateNow did raw string replacement corrupting 'default now()' inside quoted literals — now quote-aware; (3) DBStructUtils.buildColumnDdl NPE'd on null TYPE_NAME from generic drivers — null guard added (sibling buildAlterTable already had one). Regression tests added (79 green). Verified on fork HandSonic#18 (meaningful CI green) plus adversarial review.