Cover to_float, to_decimal, normalize_data_type, weather_fields,
sanitize_packet_strings, to_float_safe, has_weather_data, create_point,
extract_coordinates, lat/lon helpers, PHG extraction, and altitude
extraction with 79 new tests across 4 test files.
Drop 10 dead parser-compat columns (srccallsign, dstcallsign,
origpacket, body, header, alive, posambiguity, symboltable,
symbolcode, messaging) and move 14 display-only columns into a
single `data` JSONB column (PHG, telemetry, radiorange,
information_field, format, posresolution, position_ambiguity,
luminosity, rain_midnight).
Reduces row width from ~70 to ~48 columns. Table is ephemeral
so migration uses DROP/recreate. Also fixes snow_24h -> snow bug
in weather check query and adds null byte stripping for JSONB
string sanitization.
