fix: apply EXIF orientation during thumbnail generation

[Copilot]

Thumbnails generated for smartphone photos ignore the EXIF Orientation tag, causing images to appear rotated 90° in Gallery View and attachment previews.

Add .rotate() (no-arg, EXIF-based auto-rotation) to the sharp pipeline before .resize() in all four thumbnail generation paths:

• attachments-storage.service.ts — buffer-based thumbnail upload path
• plugins/local.ts — local storage cropImage
• plugins/minio.ts — MinIO storage cropImage
• plugins/s3.ts — S3 storage cropImage

// Before
sharp(input, { failOn: 'none', unlimited: true }).resize(width, height);

// After
sharp(input, { failOn: 'none', unlimited: true }).rotate().resize(width, height);

Sharp's .rotate() without arguments reads the EXIF Orientation tag and applies the corresponding transformation to pixel data before any subsequent operations.

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[CLAassistant]

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