refactor: rename materia → beanflows throughout codebase

- Rename src/materia/ → src/beanflows/ (Python package)
- Rename transform/sqlmesh_materia/ → transform/sqlmesh_beanflows/
- Rename infra/supervisor/materia-supervisor.service → beanflows-supervisor.service
- Rename infra/backup/materia-backup.{service,timer} → beanflows-backup.{service,timer}
- Update all path strings: /opt/materia → /opt/beanflows, /data/materia → /data/beanflows
- Update pyproject.toml: project name, CLI entrypoint, workspace source key
- Update all internal imports from materia.* → beanflows.*
- Update infra scripts: REPO_DIR, service names, systemctl references
- Fix docker-compose.prod.yml: /data/materia → /data/beanflows (bind mount path)

Intentionally left unchanged: Pulumi stack name (materia-infrastructure) and
Hetzner resource names ("materia-key", "managed_by: materia") — these reference
live cloud infrastructure and require separate cloud-side renames.

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

transform/sqlmesh_beanflows/seeds/weather_locations.csv

@@ -0,0 +1,13 @@
+location_id;name;country;lat;lon;variety
+brazil_minas_gerais;Minas Gerais;BR;-19.9167;-43.9345;Arabica
+brazil_parana;Paraná;BR;-23.4205;-51.9330;Arabica
+vietnam_highlands;Central Highlands;VN;12.6667;108.0500;Robusta
+colombia_huila;Huila;CO;2.5359;-75.5277;Arabica
+ethiopia_sidama;Sidama;ET;6.7612;38.4721;Arabica
+honduras_copan;Copán;HN;14.8333;-89.1500;Arabica
+guatemala_antigua;Antigua;GT;14.5586;-90.7295;Arabica
+indonesia_sumatra;Sumatra;ID;3.5952;98.6722;Robusta
+brazil_espirito_santo;Espírito Santo;BR;-19.3908;-40.0668;Robusta
+peru_jaen;Jaén;PE;-5.7064;-78.8077;Arabica
+uganda_elgon;Mount Elgon;UG;1.0826;34.1751;Robusta
+ivory_coast_daloa;Daloa;CI;6.8774;-6.4502;Robusta