Track the processing state of each uploaded audio file (pending, processing, complete, error) to support frontend progress tracking and error handling.

Tasks

• Create a recordings table with:
  • id, file_name, status, uploaded_at, completed_at, error_message, latitude, longitude
• Add service functions:
  • create_recording()
  • update_recording_status()
• On upload (/analyze), create a recordings row with status pending
• In background task:
  • Update status to processing, then complete or error
• Add a /recordings route to query processing states

Acceptance Criteria

• File uploads are tracked with processing status
• Frontend can query /recordings to check state
• Failures are logged without crashing the app