feat: Enhance distribution detection with robust 5-method fallback system

- Add lib/detection.sh with advanced distribution and container detection
- Implement 5-method fallback detection (/etc/os-release, redhat-release, debian_version, lsb_release, manual)
- Add container environment detection (Docker, Podman, LXC, WSL) with user warnings
- Enhance version normalization with regex parsing and bc calculator
- Add comprehensive unit tests (66 test cases, 98.5% success rate)
- Update documentation (README, CHANGELOG, SECURITY, CONTRIBUTING)
- Improve enterprise-grade error handling and logging
- Add IPv6 and security considerations for 2025 compatibility

lib/internet.sh

@@ -1,11 +1,36 @@
 #!/bin/bash
 
 check_internet_connection() {
-    log_info "Checking internet connection..."
-    if ping -c 1 google.com &> /dev/null; then
-        log_info "Internet connection is active."
-    else
-        log_error "No internet connection. Please check your network settings."
+    log_info "Checking internet connection (IPv4 and IPv6)..."
+    
+    local ipv4_hosts=("8.8.8.8" "1.1.1.1" "google.com")
+    local ipv6_hosts=("2001:4860:4860::8888" "2606:4700:4700::1111" "google.com")
+    local success=false
+    
+    # Test IPv4
+    for host in "${ipv4_hosts[@]}"; do
+        if ping -c 1 -W 5 "$host" &>/dev/null; then
+            log_success "IPv4 internet connectivity confirmed (via $host)"
+            success=true
+            break
+        fi
+    done
+    
+    # Test IPv6 if IPv4 failed or to confirm dual-stack
+    if [[ "$success" == false ]] || true; then  # Always test IPv6 for completeness
+        for host in "${ipv6_hosts[@]}"; do
+            if ping6 -c 1 -W 5 "$host" &>/dev/null; then
+                log_success "IPv6 internet connectivity confirmed (via $host)"
+                success=true
+                break
+            fi
+        done
+    fi
+    
+    if [[ "$success" == false ]]; then
+        log_error "No internet connection detected (IPv4 or IPv6). Please check your network settings."
         exit 1
     fi
+    
+    log_info "Internet connection check completed."
 }