Feature: Add Subfolder Strategy for Automatic Uploads

Based on #46

What does this PR do?

This PR introduces a new feature that allows users to automatically organize their camera uploads into subfolders based on the date the picture or video was taken. Users can choose to create subfolders by:

• Year (/2025/)
• Year and Month (/2025/11/)
• Year, Month, and Day (/2025/11/09/)

This helps users keep their cloud storage tidy and makes it easier to browse through photos from specific dates.

How is this implemented?

• Added UseSubfoldersBehaviour Enum:
  • A new enum was added to FolderBackUpConfiguration.kt to represent the different subfolder options (NONE, YEAR, YEAR_MONTH, YEAR_MONTH_DAY).
• Updated AutomaticUploadsWorker:
  • Create the function buildUploadPath to construct the remote path dynamically based on the selected UseSubfoldersBehaviour and the file's last modified date.
• Database and Migrations:
  • The FolderBackUpEntity and the corresponding database migration (MIGRATION_43_44) were updated to include the new useSubfoldersBehaviour field.

How to test this?

1. Navigate to Settings > Automatic Uploads for either pictures or videos.
2. Select a new option under the "Upload to Subfolders" preference.
3. Add a new image/video to the source folder on your device.
4. Wait for the automatic upload worker to run (or trigger it manually).
5. Verify that the file is uploaded to the correct subfolder in your cloud account.
6. Repeat for all subfolder options.

Screenshots