Implement new file upload system using official SDK

Update object storage module to use the official Replit Object Storage SDK and add a route to serve files from storage.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cd9a7d26-a4e5-4215-975c-c59f4ed1f06d
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: db73fc59-d876-4299-b896-e021264939d1
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/d0a1d46d-d203-4308-bc6a-312ac7c0243b/cd9a7d26-a4e5-4215-975c-c59f4ed1f06d/05bPjFc

app.py

@@ -417,5 +417,25 @@ def delete_sponsor():
     flash('Sponsor deleted successfully', 'success')
     return redirect(url_for('admin_sponsors'))
 
+@app.route('/storage/<path:filepath>')
+def serve_storage_file(filepath):
+    """Serve files from object storage"""
+    try:
+        if USING_OBJECT_STORAGE and storage_service:
+            file_bytes = storage_service.get_file_bytes(f"/storage/{filepath}")
+            ext = filepath.rsplit('.', 1)[-1].lower() if '.' in filepath else ''
+            content_types = {
+                'jpg': 'image/jpeg', 'jpeg': 'image/jpeg', 'png': 'image/png',
+                'gif': 'image/gif', 'webp': 'image/webp', 'svg': 'image/svg+xml'
+            }
+            content_type = content_types.get(ext, 'application/octet-stream')
+            from flask import Response
+            return Response(file_bytes, mimetype=content_type)
+        else:
+            return "Object storage not configured", 404
+    except Exception as e:
+        print(f"Error serving file {filepath}: {e}")
+        return "File not found", 404
+
 if __name__ == '__main__':
     app.run(debug=True, host='0.0.0.0', port=5000)