feat: implement photo upload component with EXIF extraction

- Add PhotoUpload component with drag-and-drop interface
- Integrate exifr library for GPS and timestamp extraction
- Implement file validation (type, size)
- Add photo previews with metadata overlay
- Support multiple photo uploads (max 5 files, 5MB each)
- Display GPS indicators and extracted metadata
- Create demo page for testing component
- Satisfies requirements 1.2, 1.3, 1.4, 1.5, 8.3

src/components/report/index.ts

@@ -0,0 +1,2 @@
+export { PhotoUpload } from './PhotoUpload';
+export type { PhotoMetadata } from './PhotoUpload';