feat(cleanup): add automatic data retention for public instances (#574)

* feat(cleanup): add automatic data retention for public instances

- Add Celery task to clean up anonymous data after configurable retention period
- Delete transcripts, meetings, and orphaned recordings older than retention days
- Only runs when PUBLIC_MODE is enabled to prevent accidental data loss
- Properly removes all associated files (local and S3 storage)
- Add manual cleanup tool for testing and intervention
- Configure retention via PUBLIC_DATA_RETENTION_DAYS setting (default: 7 days)

Fixes #571

* fix: apply pre-commit formatting fixes

* fix: properly delete recording files from storage during cleanup

- Add storage deletion for orphaned recordings in both cleanup task and manual tool
- Delete from storage before removing database records
- Log warnings if storage deletion fails but continue with database cleanup

* Apply suggestion from @pr-agent-monadical[bot]

Co-authored-by: pr-agent-monadical[bot] <198624643+pr-agent-monadical[bot]@users.noreply.github.com>

* Apply suggestion from @pr-agent-monadical[bot]

Co-authored-by: pr-agent-monadical[bot] <198624643+pr-agent-monadical[bot]@users.noreply.github.com>

* refactor: cleanup_old_data for better logging

* fix: linting

* test: fix meeting cleanup test to not require room controller

- Simplify test by directly inserting meetings into database
- Remove dependency on non-existent rooms_controller.create method
- Tests now pass successfully

* fix: linting

* refactor: simplify cleanup tool to use worker implementation

- Remove duplicate cleanup logic from manual tool
- Use the same _cleanup_old_public_data function from worker
- Remove dry-run feature as requested
- Prevent code duplication and ensure consistency
- Update documentation to reflect changes

* refactor: split cleanup worker into smaller functions

- Move all imports to the top of the file
- Extract cleanup logic into separate functions:
  - cleanup_old_transcripts()
  - cleanup_old_meetings()
  - cleanup_orphaned_recordings()
  - log_cleanup_results()
- Make code more maintainable and testable
- Add days parameter support to Celery task
- Update manual tool to work with refactored code

* feat: add TypedDict typing for cleanup stats

- Add CleanupStats TypedDict for better type safety
- Update all function signatures to use proper typing
- Add return type annotations to _cleanup_old_public_data
- Improves code maintainability and IDE support

* feat: add CASCADE DELETE to meeting_consent foreign key

- Add ondelete="CASCADE" to meeting_consent.meeting_id foreign key
- Generate and apply migration to update existing constraint
- Remove manual consent deletion from cleanup code
- Add unit test to verify CASCADE DELETE behavior

* style: linting

* fix: alembic migration branchpoint

* fix: correct downgrade constraint name in CASCADE DELETE migration

* fix: regenerate CASCADE DELETE migration with proper constraint names

- Delete problematic migration and regenerate with correct names
- Use explicit constraint name in both upgrade and downgrade
- Ensure migration works bidirectionally
- All tests passing including CASCADE DELETE test

* style: linting

* refactor: simplify cleanup to use transcripts as entry point

- Remove orphaned_recordings cleanup (not part of this PR scope)
- Remove separate old_meetings cleanup
- Transcripts are now the main entry point for cleanup
- Associated meetings and recordings are deleted with their transcript
- Use single database connection for all operations
- Update tests to reflect new approach

* refactor: cleanup and rename functions for clarity

- Rename _cleanup_old_public_data to cleanup_old_public_data (make public)
- Rename celery task to cleanup_old_public_data_task for clarity
- Update docstrings and improve code organization
- Remove unnecessary comments and simplify deletion logic
- Update tests to use new function names
- All tests passing

* style: linting\

* style: typing and review

* fix: add transaction on cleanup_single_transcript

* fix: naming

---------

Co-authored-by: pr-agent-monadical[bot] <198624643+pr-agent-monadical[bot]@users.noreply.github.com>

server/reflector/pipelines/main_file_pipeline.py

@@ -13,6 +13,7 @@ import av
 import structlog
 from celery import shared_task
 
+from reflector.asynctask import asynctask
 from reflector.db.transcripts import (
     Transcript,
     TranscriptStatus,
@@ -21,7 +22,6 @@ from reflector.db.transcripts import (
 from reflector.logger import logger
 from reflector.pipelines.main_live_pipeline import (
     PipelineMainBase,
-    asynctask,
     broadcast_to_sockets,
 )
 from reflector.processors import (