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.json

@@ -10,16 +10,17 @@
     "archiver": "^7.0.1",
     "axios": "^1.7.7",
     "better-sqlite3": "^11.10.0",
-    "cookie-parser": "^1.4.6",
-    "express": "^4.21.0",
     "bip39": "^3.1.0",
     "bitcoinjs-lib": "^6.1.6",
+    "cookie-parser": "^1.4.6",
     "csv-writer": "^1.6.0",
     "decompress": "^4.2.1",
     "dotenv": "^16.3.1",
     "ecpair": "^2.1.0",
     "ethereumjs-util": "^7.1.5",
+    "express": "^4.21.0",
     "hdkey": "^2.1.0",
+    "multer": "^2.2.0",
     "node-telegram-bot-api": "^0.64.0",
     "pino": "^8.21.0",
     "pino-pretty": "^13.1.3",