feat(download): add folder strategies and local file reconciliation

[coco1988]

Summary

Adds configurable folder strategies to the bulk download configuration and moves obsolete or excluded local files into dedicated subfolders.

Changes

• Add a folderStructure configuration with the following options:
  • none
  • date
  • weekday
• Add date-based folder organization using the image capture date.
• Add weekday-based folder organization using English weekday names, for example:

  20260804 Tuesday/
  

• Persist folderStructure in the download configuration.
• Support folderStructure when creating and updating download configurations.
• Reconcile existing local files before downloading:
  • Move files that no longer exist in the image catalog to deleted/.
  • Move files matching the blacklist to blacklist/.
• Add tests for folder strategy selection, date extraction, and weekday folder naming.

Example

With:

{
  "folderStructure": "weekday"
}

files are placed in a structure such as:

20260804 Tuesday/
└── FSG26_001_max.jpg

Files that are no longer present or are blacklisted are moved to:

deleted/
blacklist/