feat: Enhance Amazon stealth with comprehensive anti-detection

Added comprehensive stealth techniques to bypass Amazon bot detection:
- Complete HTTP headers (Accept, Accept-Language, Sec-Fetch-*, etc.)
- Extended chrome object with loadTimes, csi, app
- Permissions API override
- Plugins, languages, platform spoofing
- Battery API mocking

This significantly improves bot detection evasion compared to the basic
2-line stealth that was insufficient for Amazon's detection systems.

app/services/amazon_scraper_service.py

@@ -190,12 +190,69 @@ class AmazonScraperService:
             ),
             locale="fr-FR",
             timezone_id="Europe/Paris",
+            # Additional stealth parameters
+            extra_http_headers={
+                "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
+                "Accept-Language": "fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7",
+                "Accept-Encoding": "gzip, deflate, br",
+                "DNT": "1",
+                "Connection": "keep-alive",
+                "Upgrade-Insecure-Requests": "1",
+                "Sec-Fetch-Dest": "document",
+                "Sec-Fetch-Mode": "navigate",
+                "Sec-Fetch-Site": "none",
+                "Sec-Fetch-User": "?1",
+                "Cache-Control": "max-age=0",
+            },
         )
 
-        # Stealth mode
+        # Comprehensive stealth mode
         await context.add_init_script("""
-            Object.defineProperty(navigator, 'webdriver', { get: () => undefined });
-            window.chrome = { runtime: {} };
+            // Remove webdriver property
+            Object.defineProperty(navigator, 'webdriver', {
+                get: () => undefined
+            });
+            
+            // Add chrome property
+            window.chrome = {
+                runtime: {},
+                loadTimes: function() {},
+                csi: function() {},
+                app: {}
+            };
+            
+            // Override permissions
+            const originalQuery = window.navigator.permissions.query;
+            window.navigator.permissions.query = (parameters) => (
+                parameters.name === 'notifications' ?
+                    Promise.resolve({ state: Notification.permission }) :
+                    originalQuery(parameters)
+            );
+            
+            // Add plugins
+            Object.defineProperty(navigator, 'plugins', {
+                get: () => [1, 2, 3, 4, 5]
+            });
+            
+            // Add languages
+            Object.defineProperty(navigator, 'languages', {
+                get: () => ['fr-FR', 'fr', 'en-US', 'en']
+            });
+            
+            // Override platform
+            Object.defineProperty(navigator, 'platform', {
+                get: () => 'Win32'
+            });
+            
+            // Mock battery API
+            Object.defineProperty(navigator, 'getBattery', {
+                get: () => () => Promise.resolve({
+                    charging: true,
+                    chargingTime: 0,
+                    dischargingTime: Infinity,
+                    level: 1
+                })
+            });
         """)
 
         await context.route("**/*", lambda route: route.continue_())