freeeve / tinykvs / 21184992773

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refactor(shell): reduce cognitive complexity in SQL handlers

Extract helper functions from high-complexity functions:
- shell_csv.go: importCSV split into detectCSVFormat, parseFieldSpecs,
  importCSVRecords, parseCSVRecord, and format-specific parsers
- shell_sql.go: extractValueForLike split into extractSQLValForLike,
  extractStrValForLike, tryDecodeHexMarkerPattern, tryDecodeHexPrefixPattern
- shell_write.go: handleInsert split into insertRow, storeInsertValue,
  tryStoreMsgpack, tryStoreJSON, storeRawValue
- shell_select.go: parseWhere split into parseComparisonExpr, isKeyColumn,
  parseKeyFilter, parseKeyLikeFilter, parseValueFieldFilter, resolveFieldName,
  parseRangeCond

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