feat: rebuild Catalog with collapsible tree + product table + photo upload

- Left panel: collapsible tree (Country → City → District → Category → Subcategory)
  - Quick-add buttons: + City, + District, + Category, + Subcategory
  - Delete buttons with confirmation on all nodes
  - Product count badges on each node
  - Click node to filter right panel
- Right panel: Product table with Photo, Name, Category, Subcategory, Price, Stock
  - Edit (✎) and Delete (✕) buttons per row
  - Add Product modal with all fields
- Product edit form: name, price, stock, description, category, subcategory (JS filtered),
  photo_url/hidden_photo_url (URL or file upload), hidden_coordinates, hidden_description, private_data
- Multer file upload for photos stored in /uploads/
- Routes: add-city, add-district, product CRUD with photo upload
- Product JSON API for modal editing
- Responsive grid: tree (320px) + table (1fr)

package-lock.json

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