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>

pyproject.toml

@@ -1,5 +1,5 @@
 [project]
-name = "materia"
+name = "beanflows"
 version = "0.1.0"
 description = "Add your description here"
 readme = "readme.md"
@@ -20,7 +20,7 @@ dependencies = [
 ]
 
 [project.scripts]
-materia = "materia.cli:app"
+beanflows = "beanflows.cli:app"
 
 
 [dependency-groups]
@@ -43,7 +43,7 @@ dev = [
 [tool.uv.sources]
 extract_core = {workspace = true }
 psdonline = {workspace = true }
-sqlmesh_materia = {workspace = true }
+sqlmesh_beanflows = {workspace = true }
 cftc_cot = {workspace = true }
 coffee_prices = {workspace = true }
 ice_stocks = {workspace = true }