[sb123sb123]

What

• Skip connector schedule checks, scheduled automation selection, knowledge-store reindex sweeps and drift checks while hosted sunset mode is active.
• Keep the Beat entries registered so sunset-off and self-hosted behavior stays unchanged; document the maintenance tasks that continue through the wind-down.
• Add parameterized tests for sunset-on, sunset-off and self-hosted configurations.

Why

The HTTP write-block middleware does not stop Celery Beat from starting recurring user work during the hosted export-only period.

Fixes #2005

How to test

• ruff check on the five changed Python files - passed.
• python -m py_compile on the five changed Python files - passed.
• python scripts/check_docs.py docs/architecture/sunset.md - passed.
• python -m pytest tests/unit/test_sunset_scheduled_tasks.py -q - attempted locally, but collection stops because fastapi_users is not installed in the remote environment; please let CI run the test with project dependencies.

High-level PR Summary

This PR pauses recurring user-facing scheduled tasks during the hosted sunset mode (export-only period) by adding sunset-mode checks to four Celery Beat tasks: connector schedule checks, scheduled automation selection, knowledge-store reindex sweeps, and drift checks. The Beat entries remain registered to preserve behavior when sunset mode is off or on self-hosted deployments. The changes include comprehensive parameterized tests covering sunset-on, sunset-off, and self-hosted configurations, plus documentation updates explaining which maintenance tasks continue during wind-down.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	docs/architecture/sunset.md
2	surfsense_backend/app/sunset.py
3	surfsense_backend/app/tasks/celery_tasks/schedule_checker_task.py
4	surfsense_backend/app/automations/triggers/builtin/schedule/selector.py
5	surfsense_backend/app/tasks/celery_tasks/knowledge_store/index_tasks.py
6	surfsense_backend/app/tasks/celery_tasks/knowledge_store/drift_monitor_task.py
7	surfsense_backend/tests/unit/test_sunset_scheduled_tasks.py

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