fix: rename root package to beanflows-pipeline to avoid workspace conflict

The web package is already named 'beanflows'. Renaming the root CLI/infra
package to 'beanflows-pipeline' (src/beanflows_pipeline/) resolves the
uv workspace name conflict and Python namespace collision.

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

infra/supervisor/beanflows-supervisor.service

@@ -7,7 +7,7 @@ Wants=network-online.target
 Type=simple
 User=beanflows_service
 WorkingDirectory=/opt/beanflows
-ExecStart=/bin/sh -c 'exec uv run python src/beanflows/supervisor.py'
+ExecStart=/bin/sh -c 'exec uv run python src/beanflows_pipeline/supervisor.py'
 Restart=always
 RestartSec=10
 EnvironmentFile=/opt/beanflows/.env