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/styles/shared-legal.scss

@@ -451,7 +451,7 @@
   display: inline-block;
   padding: 0.75rem 1.5rem;
   background: var(--gradient-primary);
-  color: white;
+  color: white !important;
   border-radius: var(--radius-md);
   text-decoration: none;
   font-weight: 600;