feat: Integrate photo upload with MinIO storage and Sharp optimization

Now uses the existing infrastructure instead of base64:
- Created photos API client for multipart/form-data upload
- Upload to /api/v1/photos/upload endpoint
- Backend handles Sharp image optimization (resize, compress, format conversion)
- MinIO/S3-compatible storage for scalable file management
- 10MB file size limit (up from 5MB base64)
- Shows upload progress with spinner
- Returns optimized CDN-ready URLs
- Proper error handling with backend validation

Benefits over previous base64 approach:
✅ Images optimized with Sharp (smaller sizes, better quality)
✅ Stored in MinIO (scalable object storage)
✅ CDN-ready URLs for fast delivery
✅ No database bloat from base64 strings
✅ Supports larger files (10MB vs 5MB)
✅ Automatic thumbnail generation
✅ Better performance and scalability

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/components/children/ChildDialog.tsx

@@ -153,6 +153,8 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
             onChange={(url) => setFormData({ ...formData, photoUrl: url })}
             disabled={isLoading}
             size={80}
+            childId={child?.id}
+            type="profile"
           />
         </Box>
       </DialogContent>

maternal-web/components/common/PhotoUpload.tsx

@@ -9,8 +9,10 @@ import {
   Typography,
   Paper,
   Alert,
+  CircularProgress,
 } from '@mui/material';
 import { PhotoCamera, Person } from '@mui/icons-material';
+import { photosApi } from '@/lib/api/photos';
 
 interface PhotoUploadProps {
   value: string;
@@ -18,6 +20,8 @@ interface PhotoUploadProps {
   label: string;
   disabled?: boolean;
   size?: number;
+  childId?: string;
+  type?: string;
 }
 
 export function PhotoUpload({
@@ -25,10 +29,13 @@ export function PhotoUpload({
   onChange,
   label,
   disabled = false,
-  size = 100
+  size = 100,
+  childId,
+  type = 'profile'
 }: PhotoUploadProps) {
   const [imageError, setImageError] = useState(false);
   const [uploadError, setUploadError] = useState<string>('');
+  const [uploading, setUploading] = useState(false);
   const fileInputRef = useRef<HTMLInputElement>(null);
 
   const handleImageError = () => {
@@ -49,30 +56,37 @@ export function PhotoUpload({
       return;
     }
 
-    // Validate file size (max 5MB)
-    const maxSize = 5 * 1024 * 1024; // 5MB
+    // Validate file size (max 10MB - backend limit)
+    const maxSize = 10 * 1024 * 1024; // 10MB
     if (file.size > maxSize) {
-      setUploadError('Image size must be less than 5MB');
+      setUploadError('Image size must be less than 10MB');
       return;
     }
 
-    // Convert to base64
-    const reader = new FileReader();
-    reader.onload = (e) => {
-      const base64String = e.target?.result as string;
-      onChange(base64String);
+    try {
+      setUploading(true);
       setUploadError('');
+
+      // Upload to backend - it handles Sharp optimization and MinIO storage
+      const result = await photosApi.uploadPhoto(file, {
+        childId,
+        type,
+      });
+
+      // Use the optimized URL from backend
+      onChange(result.photo.url);
       setImageError(false);
-    };
-    reader.onerror = () => {
-      setUploadError('Failed to read image file');
-    };
-    reader.readAsDataURL(file);
+    } catch (error: any) {
+      console.error('Photo upload failed:', error);
+      setUploadError(error.response?.data?.message || 'Failed to upload photo');
+    } finally {
+      setUploading(false);
 
       // Reset input
       if (fileInputRef.current) {
         fileInputRef.current.value = '';
       }
+    }
   };
 
   const handleCameraClick = () => {
@@ -126,7 +140,7 @@ export function PhotoUpload({
             accept="image/*"
             style={{ display: 'none' }}
             onChange={handleFileSelect}
-            disabled={disabled}
+            disabled={disabled || uploading}
           />
 
           <IconButton
@@ -142,10 +156,14 @@ export function PhotoUpload({
               },
             }}
             size="small"
-            disabled={disabled}
+            disabled={disabled || uploading}
             onClick={handleCameraClick}
           >
+            {uploading ? (
+              <CircularProgress size={20} />
+            ) : (
               <PhotoCamera fontSize="small" />
+            )}
           </IconButton>
         </Box>
 
@@ -156,8 +174,12 @@ export function PhotoUpload({
           fullWidth
           size="small"
           placeholder="https://example.com/photo.jpg"
-          disabled={disabled}
-          helperText="Click camera to upload or paste an image URL"
+          disabled={disabled || uploading}
+          helperText={
+            uploading
+              ? 'Uploading and optimizing image...'
+              : 'Click camera to upload (auto-optimized) or paste URL'
+          }
         />
       </Paper>
     </Box>

maternal-web/lib/api/photos.ts

@@ -0,0 +1,48 @@
+import apiClient from './client';
+
+export interface PhotoUploadResult {
+  photo: {
+    id: string;
+    url: string;
+    thumbnailUrl?: string;
+    originalUrl?: string;
+    storageKey: string;
+  };
+}
+
+export const photosApi = {
+  /**
+   * Upload a photo for profile/child
+   * Uses multipart/form-data to send file to backend
+   * Backend handles image optimization via Sharp and storage via MinIO
+   */
+  uploadPhoto: async (
+    file: File,
+    options?: {
+      childId?: string;
+      type?: string;
+      caption?: string;
+    }
+  ): Promise<PhotoUploadResult> => {
+    const formData = new FormData();
+    formData.append('photo', file);
+
+    if (options?.childId) {
+      formData.append('childId', options.childId);
+    }
+    if (options?.type) {
+      formData.append('type', options.type);
+    }
+    if (options?.caption) {
+      formData.append('caption', options.caption);
+    }
+
+    const response = await apiClient.post('/api/v1/photos/upload', formData, {
+      headers: {
+        'Content-Type': 'multipart/form-data',
+      },
+    });
+
+    return response.data.data;
+  },
+};