Fix CI/CD: resolve integration test syntax errors and handle redirects

- Fixed shell arithmetic syntax: changed ((errors++)) to errors=$((errors + 1))
- Added -L flag to curl for following redirects automatically
- Treat HTTP 301/302 redirects as successful responses
- Improved error counting logic with proper if statements
- Added zero division protection for success rate calculation

This should resolve the '/bin/sh: errors++: not found' error and handle redirects properly.

.drone.yml

@@ -271,11 +271,14 @@ steps:
           local description="$2"
           echo "Testing $description ($url)..."
           
-          local status_code=$(curl -o /dev/null -s -w "%{http_code}" -m 10 "$url" 2>/dev/null || echo "000")
+          local status_code=$(curl -L -o /dev/null -s -w "%{http_code}" -m 10 "$url" 2>/dev/null || echo "000")
           
           if [ "$status_code" = "200" ]; then
             echo "✅ $description - OK (HTTP $status_code)"
             return 0
+          elif [ "$status_code" = "301" ] || [ "$status_code" = "302" ]; then
+            echo "✅ $description - Redirect (HTTP $status_code)"
+            return 0
           elif [ "$status_code" = "404" ]; then
             echo "⚠️ $description - Not Found (HTTP $status_code)"
             return 1
@@ -294,25 +297,38 @@ steps:
         
         # Основные страницы
         total_tests=$((total_tests + 1))
-        test_endpoint "$TEST_TARGET/" "Homepage" || ((errors++))
+        if ! test_endpoint "$TEST_TARGET/" "Homepage"; then
+          errors=$((errors + 1))
+        fi
         
         total_tests=$((total_tests + 1))
-        test_endpoint "$TEST_TARGET/services/" "Services page" || ((errors++))
+        if ! test_endpoint "$TEST_TARGET/services/" "Services page"; then
+          errors=$((errors + 1))
+        fi
         
         total_tests=$((total_tests + 1))
-        test_endpoint "$TEST_TARGET/career/" "Career page" || ((errors++))
+        if ! test_endpoint "$TEST_TARGET/career/" "Career page"; then
+          errors=$((errors + 1))
+        fi
         
         total_tests=$((total_tests + 1))
-        test_endpoint "$TEST_TARGET/contact/" "Contact page" || ((errors++))
+        if ! test_endpoint "$TEST_TARGET/contact/" "Contact page"; then
+          errors=$((errors + 1))
+        fi
         
         total_tests=$((total_tests + 1))
-        test_endpoint "$TEST_TARGET/admin/" "Admin panel" || echo "ℹ️ Admin panel test failed (expected for production)"
+        if ! test_endpoint "$TEST_TARGET/admin/" "Admin panel"; then
+          echo "ℹ️ Admin panel test failed (expected for production)"
+        fi
         
         echo ""
         echo "📊 Integration Test Results:"
         echo "   Total tests: $total_tests"
         echo "   Failures: $errors"
-        echo "   Success rate: $(( (total_tests - errors) * 100 / total_tests ))%"
+        if [ $total_tests -gt 0 ]; then
+          success_rate=$(( (total_tests - errors) * 100 / total_tests ))
+          echo "   Success rate: ${success_rate}%"
+        fi
         
         if [ $errors -gt 2 ]; then
           echo "❌ Too many critical endpoint failures ($errors)"