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>

extract/psdonline/pyproject.toml

@@ -2,16 +2,13 @@
 name = "psdonline"
 version = "0.1.0"
 description = "Add your description here"
-readme = "README.md"
 authors = [
     { name = "Deeman", email = "hendriknote@gmail.com" }
 ]
 requires-python = ">=3.13"
 
 dependencies = [
-    "boto3>=1.40.55",
     "niquests>=3.14.1",
-    "pendulum>=3.1.0",
 ]
 [project.scripts]
 extract_psd = "psdonline.execute:extract_psd_dataset"