feat: Add Amazon France search page with Crawl4AI anti-detection

- Created Amazon scraper service with advanced anti-bot techniques:
  * User-Agent rotation from realistic pool
  * Complete browser headers (Accept, Accept-Language, etc.)
  * Proxy rotation (10 residential proxies)
  * Random delays (1.5-4s) to mimic human behavior
  * Crawl4AI browser fingerprint randomization
  * NetworkIdle waiting for complete page load
  * Cookie acceptance automation

- Added Amazon search API endpoint with SSE streaming
  * Real-time progress updates
  * Proper error handling
  * Health check endpoint

- Created dedicated Amazon France frontend page:
  * Modern UI with product cards
  * Rating display (stars + review count)
  * Price formatting with discount badges
  * Prime badge support
  * Stock status indicators
  * Sponsored product labels
  * Direct Amazon links

- Removed store list (ENSEIGNES_DATA cleared)
  * Migration from discount stores to Amazon France
  * Catalog system kept for future use

- Updated navigation:
  * Added "Amazon France" menu item with ShoppingBag icon
  * Positioned between Search and Compare
  * Available on desktop and mobile

Technical stack:
- Backend: Crawl4AI + BeautifulSoup for scraping
- Frontend: React + Shadcn UI components
- API: FastAPI with SSE streaming

app/main.py

@@ -13,7 +13,7 @@ from sqlalchemy import text
 
 from app.database import SessionLocal, engine
 from app.limiter import limiter
-from app.routers import auth, items, jobs, notifications, openrouter, search, search_sites, settings, debug, catalogues
+from app.routers import auth, items, jobs, notifications, openrouter, search, search_sites, settings, debug, catalogues, amazon
 from app.services.scheduler_service import scheduled_refresh, scheduler
 from app.services import auth_service, search_service, seed_enseignes
 from app.services.scheduler import start_scheduler as start_catalog_scheduler, stop_scheduler as stop_catalog_scheduler
@@ -190,6 +190,9 @@ app.include_router(catalogues.router)
 # Auth router (already has /api prefix)
 app.include_router(auth.router)
 
+# Amazon router (already has /api prefix)
+app.include_router(amazon.router)
+
 
 @app.get("/api/")
 def read_root():