Add comprehensive anti-scan and brute force protection

Implement multi-layered security system to protect against exploit
scanning and brute force attacks while maintaining legitimate traffic flow.

Security Features:
- Attack detection for common exploit paths (WordPress, phpMyAdmin, shells)
- Malicious user agent filtering (sqlmap, nikto, metasploit, etc.)
- SQL injection and directory traversal pattern detection
- Progressive rate limiting (50 req/10s, 20 conn/10s, 10 err/10s)
- Three-tier response: tarpit → deny → repeat offender blocking
- Strict authentication endpoint protection (5 req/10s limit)
- Real IP detection through proxy headers (Cloudflare, X-Real-IP)

Management Tools:
- manage-blocked-ips.sh: Dynamic IP blocking/unblocking
- monitor-attacks.sh: Real-time threat monitoring
- API endpoints for security stats and temporary blocking
- Auto-expiring temporary blocks with cleanup endpoint

HAProxy 2.6 Compatibility:
- Removed silent-drop (not available in 2.6)
- Fixed stick table counter syntax
- Using standard tarpit and deny actions

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

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

scripts/monitor-attacks.sh

@@ -0,0 +1,73 @@
+#!/bin/bash
+
+# Real-time attack monitoring for HAProxy
+# Shows blocked requests and suspicious activity
+
+LOG_FILE="/var/log/haproxy.log"
+SOCKET="/tmp/haproxy-cli"
+
+echo "==================================================="
+echo "HAProxy Security Monitor - Real-time Attack Detection"
+echo "==================================================="
+echo ""
+
+# Function to show current threats
+show_threats() {
+    echo "Current Threat IPs (from stick table):"
+    echo "show table web" | socat stdio "$SOCKET" 2>/dev/null | \
+        awk '$4 > 0 || $5 > 0 || $6 > 30 || $7 > 5 || $8 > 10 {
+            printf "%-15s req_rate:%-3s err_rate:%-3s conn_rate:%-3s blocked:%s repeat:%s\n",
+                   $1, $6, $7, $8, $4, $5
+        }' | head -20
+    echo "---------------------------------------------------"
+}
+
+# Function to show recent blocks
+show_recent_blocks() {
+    echo "Recent Blocked Requests:"
+    tail -100 "$LOG_FILE" 2>/dev/null | \
+        grep -E "(scanner|exploit|ratelimit|repeat|tarpit|denied|dropped)" | \
+        tail -10 | \
+        awk '{
+            if (match($0, /[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+/)) {
+                ip = substr($0, RSTART, RLENGTH)
+                gsub(/:.*/, "", ip)
+                reason = ""
+                if ($0 ~ /scanner/) reason = "SCANNER"
+                else if ($0 ~ /exploit/) reason = "EXPLOIT"
+                else if ($0 ~ /ratelimit/) reason = "RATE_LIMIT"
+                else if ($0 ~ /repeat/) reason = "REPEAT_OFFENDER"
+                else if ($0 ~ /tarpit/) reason = "TARPIT"
+                else if ($0 ~ /denied/) reason = "DENIED"
+                else if ($0 ~ /dropped/) reason = "DROPPED"
+                printf "[%s] %-15s %s\n", strftime("%H:%M:%S"), ip, reason
+            }
+        }'
+    echo ""
+}
+
+# Monitor mode selection
+if [ "$1" == "live" ]; then
+    echo "Live monitoring mode - Press Ctrl+C to exit"
+    echo ""
+
+    while true; do
+        clear
+        echo "==================================================="
+        echo "HAProxy Security Monitor - $(date '+%Y-%m-%d %H:%M:%S')"
+        echo "==================================================="
+        echo ""
+        show_threats
+        echo ""
+        show_recent_blocks
+        sleep 5
+    done
+else
+    # Single run mode
+    show_threats
+    echo ""
+    show_recent_blocks
+    echo ""
+    echo "Tip: Run with 'live' parameter for continuous monitoring"
+    echo "Usage: $0 [live]"
+fi