fix: Bot activity tracking performance - 523x faster (3000ms to 5.74ms)

- Fixed BotActivityTracker configuration key mismatch (LittleShop:BaseUrl -> LittleShop:ApiUrl)
- Resolved DNS resolution failures causing 3-second timeouts on every activity tracking call
- Updated fallback from Docker hostname (littleshop:5000) to localhost (localhost:5000)
- Added comprehensive E2E integration test script for LittleShop + TeleBot + SilverPay
- Documented all test results with performance metrics and troubleshooting steps

Performance Improvement: 523x faster (from 3000ms+ to 5.74ms average)

Remaining Issue: SilverPay payment gateway not accessible at http://10.0.0.51:5500
Payment creation fails with HTTP 404 - requires infrastructure investigation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

TeleBot/TeleBot/Services/BotActivityTracker.cs

@@ -36,7 +36,7 @@ namespace TeleBot.Services
             _httpClient = httpClient;
             _configuration = configuration;
             _logger = logger;
-            _littleShopUrl = configuration["LittleShop:BaseUrl"] ?? "http://littleshop:5000";
+            _littleShopUrl = configuration["LittleShop:ApiUrl"] ?? "http://localhost:5000";
         }
 
         public async Task TrackActivityAsync(