Enhance cloud connectivity test with detailed feedback

Improved "Cloud Connectivity Test" section:
- Now shows as dedicated section with bold header
- Displays full URL being tested (https://us5-cloud.acronis.com)
- Shows HTTP status code on success (e.g., "✓ Reachable (HTTP 200)")
- Provides troubleshooting steps on failure:
  • Check internet connectivity
  • Verify firewall allows HTTPS (port 443)
  • Manual test command provided

This makes it easy to verify the agent can reach Acronis cloud
and diagnose connectivity issues.

modules/backup/acronis-agent-status.sh

@@ -188,16 +188,30 @@ fi
 echo ""
 
 # Check outbound connectivity to cloud (port 443)
+echo ""
+echo -e "${BOLD}Cloud Connectivity Test:${NC}"
+
 if command -v curl >/dev/null 2>&1; then
     reg_url=$(grep -oP '<address>\K[^<]+' /var/lib/Acronis/BackupAndRecovery/MMS/user.config 2>/dev/null)
     if [ -n "$reg_url" ]; then
-        echo -n "Testing cloud connectivity... "
-        if timeout 5 curl -s -o /dev/null -w "%{http_code}" "$reg_url" 2>/dev/null | grep -q "^[2-4]"; then
-            echo -e "${GREEN}✓${NC} Connected"
+        echo -n "  Testing ${reg_url}... "
+
+        http_code=$(timeout 5 curl -s -o /dev/null -w "%{http_code}" "$reg_url" 2>/dev/null)
+
+        if [ "$http_code" -ge 200 ] && [ "$http_code" -lt 500 ]; then
+            echo -e "${GREEN}✓ Reachable${NC} (HTTP $http_code)"
         else
-            echo -e "${YELLOW}⚠${NC} Cannot reach cloud (may be firewall/network issue)"
+            echo -e "${RED}✗ Unreachable${NC}"
+            echo -e "  ${YELLOW}⚠${NC} Cannot reach Acronis cloud (firewall/network issue)"
+            echo "  • Check internet connectivity"
+            echo "  • Verify firewall allows HTTPS (port 443)"
+            echo "  • Test manually: curl -I $reg_url"
         fi
+    else
+        echo -e "  ${YELLOW}⚠${NC} Cloud URL not found in config"
     fi
+else
+    echo -e "  ${YELLOW}⚠${NC} curl not installed (cannot test connectivity)"
 fi
 
 echo ""