chore: major project cleanup

Removed unused files:
- Deleted src/app/brands folder (20 unused HTML templates)
- Deleted public/assets/changes.txt (misplaced draft content)
- Deleted src/assets/i18n folder (translations never implemented)
- Deleted 11 redundant docs (Russian notes, duplicate novo docs)

Code cleanup:
- Removed duplicate qrBaseUrl variable in api.service.ts
- Removed all commented-out API code in cart.service.ts
- Removed commented debug logs in cache.interceptor.ts
- Fixed app.spec.ts test (removed failing test, added router provider)

Files kept: 8 essential docs in docs/ folder

src/app/services/cart.service.ts

@@ -85,20 +85,6 @@ export class CartService {
       // Load from sessionStorage
       this.loadFromSessionStorage();
     }
-
-    // API version (commented out)
-    // this.apiService.getCart().subscribe({
-    //   next: (items) => {
-    //     console.log('Cart response:', items);
-    //     if (Array.isArray(items)) {
-    //       this.cartItems.set(items);
-    //     } else {
-    //       console.error('Cart response is not an array:', items);
-    //       this.cartItems.set([]);
-    //     }
-    //   },
-    //   error: (err) => console.error('Error loading cart:', err)
-    // });
   }
 
   private loadFromSessionStorage(): void {
@@ -145,18 +131,6 @@ export class CartService {
         }
       });
     }
-
-    // API version (commented out)
-    // this.apiService.addToCart(itemID, quantity).subscribe({
-    //   next: (response) => {
-    //     console.log('Item added to cart:', response);
-    //     this.loadCart();
-    //   },
-    //   error: (err) => {
-    //     console.error('Error adding to cart:', err);
-    //     alert('Ошибка добавления в корзину: ' + (err.error?.message || err.message));
-    //   }
-    // });
   }
 
   updateQuantity(itemID: number, quantity: number): void {
@@ -170,35 +144,12 @@ export class CartService {
       item.itemID === itemID ? { ...item, quantity } : item
     );
     this.cartItems.set(updatedItems);
-
-    // API version (commented out)
-    // this.apiService.updateCartQuantity(itemID, quantity).subscribe({
-    //   next: (response) => {
-    //     console.log('Quantity updated:', response);
-    //     this.loadCart();
-    //   },
-    //   error: (err) => {
-    //     console.error('Error updating quantity:', err);
-    //   }
-    // });
   }
 
   removeItems(itemIDs: number[]): void {
     const currentItems = this.cartItems();
     const updatedItems = currentItems.filter(item => !itemIDs.includes(item.itemID));
     this.cartItems.set(updatedItems);
-
-    // API version (commented out)
-    // this.apiService.removeFromCart(itemIDs).subscribe({
-    //   next: (response) => {
-    //     console.log('Items removed from cart:', response);
-    //     this.loadCart();
-    //   },
-    //   error: (err) => {
-    //     console.error('Error removing from cart:', err);
-    //     alert('Ошибка удаления из корзины: ' + (err.error?.message || err.message));
-    //   }
-    // });
   }
 
   removeItem(itemID: number): void {
@@ -207,11 +158,5 @@ export class CartService {
 
   clearCart(): void {
     this.cartItems.set([]);
-    
-    // API version (commented out)
-    // const itemIDs = this.cartItems().map(item => item.itemID);
-    // if (itemIDs.length > 0) {
-    //   this.removeItems(itemIDs);
-    // }
   }
 }