- Implement UploadService with Sharp integration for image processing
- Add file validation for MIME types, size limits, and safety checks
- Support batch file processing with duplicate detection
- Generate image thumbnails and optimize for web display
- Implement quota checking by user plan (Basic: 50, Pro: 500, Max: 1000)
- Extract image metadata (dimensions, format, etc.)
Resolves requirements §26-§27 for file upload validation and limits.
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Co-Authored-By: Claude <noreply@anthropic.com>
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