MySQL PDO returns DECIMAL/FLOAT columns as strings, causing json_encode
to emit them as JSON strings ("9.99") instead of numbers (9.99).
Android's Gson Map parsing fails the as? Number cast on strings,
defaulting to 0.0. Cast Price to (float) before building the response.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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