Remove the dead METEO_* fetch path

Confirmed via git history it's not a separate vendor: the very first
commit (2023-04-13) included real sample CSVs from it with a Latvian
header identical to the LVGMC/open-data fields — same underlying LVĢMC
data, just an earlier delivery mechanism superseded by the FTP feed and
never removed. Never wired into anything that runs (Server.scala's
import was already commented out).

.env-sample

@@ -12,10 +12,6 @@ ENABLE_SCHEDULED_JOBS=true
 # and would otherwise crash-loop the whole app rather than just fail quietly.
 ENABLE_LEGACY_PROVIDER_JOBS=false
 
-METEO_USER=aaa
-METEO_PASSWORD=aaa
-METEO_URL=aaa
-
 LVGMC_URL=aaa
 LVGMC_USER=aaa
 LVGMC_PASSWORD=aaa