Refactor to local-first architecture on Hetzner NVMe

Remove distributed R2/Iceberg/SSH pipeline architecture in favor of
local subprocess execution with NVMe storage. Landing data backed up
to R2 via rclone timer.

- Strip Iceberg catalog, httpfs, boto3, paramiko, prefect, pyarrow
- Pipelines run via subprocess.run() with bounded timeouts
- Extract writes to {LANDING_DIR}/psd/{year}/{month}/{etag}.csv.gzip
- SQLMesh reads LANDING_DIR variable, writes to DUCKDB_PATH
- Delete unused provider stubs (ovh, scaleway, oracle)
- Add rclone systemd timer for R2 backup every 6h
- Update supervisor to run pipelines with env vars

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

transform/sqlmesh_materia/models/raw/psd_data.sql

@@ -21,4 +21,4 @@ MODEL (
 )
 );
 select *
-FROM read_csv('extract/psdonline/src/psdonline/data/*.csv.gzip', delim=',', encoding='utf-8', compression='gzip', max_line_size=10000000, header=true, union_by_name=true, filename=true, names = ['commodity_code', 'commodity_description', 'country_code', 'country_name', 'market_year', 'calendar_year', 'month', 'attribute_id', 'attribute_description', 'unit_id', 'unit_description', 'value'], all_varchar=true)
+FROM read_csv('{{ var("LANDING_DIR") }}/psd/**/*.csv.gzip', delim=',', encoding='utf-8', compression='gzip', max_line_size=10000000, header=true, union_by_name=true, filename=true, names = ['commodity_code', 'commodity_description', 'country_code', 'country_name', 'market_year', 'calendar_year', 'month', 'attribute_id', 'attribute_description', 'unit_id', 'unit_description', 'value'], all_varchar=true)

transform/sqlmesh_materia/models/staging/stg_psdalldata__commodity.sql

@@ -41,7 +41,7 @@ select
     any_value(unit_name) as unit_name,
     any_value(value) as value, 
     hash(commodity_code, commodity_name, country_code, country_name, market_year, calendar_year, month, attribute_id, attribute_name, unit_id, unit_name, value) as hkey,
-    any_value(make_date(split(filename, '/')[-4]::int, split(filename, '/')[-3]::int, 1)) as ingest_date,
+    any_value(make_date(split(filename, '/')[-3]::int, split(filename, '/')[-2]::int, 1)) as ingest_date,
     any_value(if(month!=0,last_day(make_date(market_year, month, 1)),null)) as market_date_month_end,
   from cast_dtypes
   group by hkey