Recover in-progress submissions when the FileAggregate is missing #810

Summary

Add recovery support for files left in the inprogress directory when the corresponding FileAggregate stream was never created.

Proposed behaviour

During startup recovery:

• Parse the estate ID and file ID from the in-progress filename.
• Retry through the existing FileAggregate path when the aggregate exists.
• If the aggregate is missing, find the file by file ID in the import-log read model.
• Use the recovered merchant, user, import-log, profile, and upload timestamp metadata to submit the file as an initial ProcessUploadedFile operation.
• Use the file ID from the filename so the FileAggregate can be created and processing can continue.

Acceptance criteria

• Existing aggregate-backed retries continue to work.
• An in-progress file with no FileAggregate can be submitted and processed.
• The recovered submission preserves the original upload metadata.
• Recovery is covered by automated tests.