feat: replace Cloudinary with MinIO for all media storage

- Create server/services/minio.ts: S3-compatible service (same interface as
  cloudinaryService) using @aws-sdk/client-s3 and MINIO_ENDPOINT env var
- Replace all cloudinaryService imports with minioService across routes.ts,
  routes/reels.ts, routes/remotion.ts, services/media-purge.ts
- Replace Cloudinary logo URL pattern (res.cloudinary.com/...) with
  buildMinioUrl() helper throughout all server routes
- GET /api/cloudinary/config now returns a logoUrl field (full MinIO URL)
  so clients never need to build the URL themselves
- Update settings pages (desktop + mobile): labels changed to MinIO
  (Bucket Name, Access Key, Secret Key)
- Update image-editor.tsx: remove Cloudinary URL transformation, use logoUrl
- Update media-utils.ts: simplify getVideoThumbnailUrl (no URL transforms)
- Add MINIO_ENDPOINT and MINIO_PUBLIC_URL to docker-compose.yml + .env.example
- DB table reuse: cloudinary_config.cloud_name = bucket, api_key = access key,
  api_secret = secret key — no migration needed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/src/pages/image-editor.tsx

@@ -112,45 +112,10 @@ export default function ImageEditor() {
   });
 
 
-  // Generate Cloudinary transformation URL
+  // Set preview URL from selected media
   useEffect(() => {
-    if (!selectedMedia) {
-      setPreviewUrl("");
-      return;
-    }
-
-    // Start with base image URL
-    let url = selectedMedia.originalUrl;
-    
-    // Extract Cloudinary parts
-    const cloudinaryPattern = /https:\/\/res\.cloudinary\.com\/([^\/]+)\/image\/upload\//;
-    const match = url.match(cloudinaryPattern);
-    
-    if (!match) {
-      setPreviewUrl(url);
-      return;
-    }
-
-    const [fullMatch, cloudName] = match;
-    const imagePath = url.replace(fullMatch, '');
-    
-    // Build transformations array
-    const transformations: string[] = [];
-
-    // Base resize
-    transformations.push('w_800,h_800,c_fit');
-
-    // Note: Ribbon and price badge overlays are rendered as CSS elements in preview
-    // They are NOT added to Cloudinary transformation URL
-    // This allows for better visual control and positioning
-
-    // Logo overlay will be added by backend when saving
-    // Preview just shows the base image with CSS overlays
-
-    // Construct final URL
-    const transformedUrl = `https://res.cloudinary.com/${cloudName}/image/upload/${transformations.join('/')}/${imagePath}`;
-    setPreviewUrl(transformedUrl);
-
+    if (!selectedMedia) { setPreviewUrl(""); return; }
+    setPreviewUrl(selectedMedia.originalUrl);
   }, [selectedMedia, ribbon, priceBadge, logo]);
 
   return (
@@ -620,9 +585,9 @@ export default function ImageEditor() {
                           )}
 
                           {/* Logo Overlay (CSS) */}
-                          {logo.enabled && cloudinaryConfig && (cloudinaryConfig as any).logoPublicId && (
+                          {logo.enabled && cloudinaryConfig && (cloudinaryConfig as any).logoUrl && (
                             <img
-                              src={`https://res.cloudinary.com/${(cloudinaryConfig as any).cloudName}/image/upload/${(cloudinaryConfig as any).logoPublicId}`}
+                              src={(cloudinaryConfig as any).logoUrl}
                               alt="Logo"
                               className={`absolute ${
                                 logo.position === "north_east" ? "top-4 right-4" :