pkjmesra / PKScreener / 20622149957

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Fix PKL loading to merge duplicate lowercase/uppercase OHLCV columns

When loading DataFrame from PKL, some data has both 'open' and 'Open'
columns where lowercase has older data and uppercase has newer data.
This fix merges them correctly using fillna() to preserve all data.

Also adds minimum row count check (20 rows) to ensure data quality
before using local cache.

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