refactor: fix biome linting issues and update project documentation

- Fix 36+ biome linting issues reducing errors/warnings from 227 to 191
- Replace explicit 'any' types with proper TypeScript interfaces
- Fix React hooks dependencies and useCallback patterns
- Resolve unused variables and parameter assignment issues
- Improve accessibility with proper label associations
- Add comprehensive API documentation for admin and security features
- Update README.md with accurate PostgreSQL setup and current tech stack
- Create complete documentation for audit logging, CSP monitoring, and batch processing
- Fix outdated project information and missing developer workflows

components/security/ThreatLevelIndicator.tsx

@@ -0,0 +1,84 @@
+"use client";
+
+import { AlertCircle, AlertTriangle, Shield, Zap } from "lucide-react";
+import { Badge } from "@/components/ui/badge";
+
+interface ThreatLevelIndicatorProps {
+  level: "LOW" | "MODERATE" | "HIGH" | "CRITICAL";
+  score?: number;
+  size?: "sm" | "md" | "lg";
+}
+
+export function ThreatLevelIndicator({
+  level,
+  score,
+  size = "md",
+}: ThreatLevelIndicatorProps) {
+  const getConfig = (threatLevel: string) => {
+    switch (threatLevel) {
+      case "CRITICAL":
+        return {
+          color: "destructive",
+          bgColor: "bg-red-500",
+          icon: Zap,
+          text: "Critical Threat",
+          description: "Immediate action required",
+        };
+      case "HIGH":
+        return {
+          color: "destructive",
+          bgColor: "bg-orange-500",
+          icon: AlertCircle,
+          text: "High Threat",
+          description: "Urgent attention needed",
+        };
+      case "MODERATE":
+        return {
+          color: "secondary",
+          bgColor: "bg-yellow-500",
+          icon: AlertTriangle,
+          text: "Moderate Threat",
+          description: "Monitor closely",
+        };
+      default:
+        return {
+          color: "outline",
+          bgColor: "bg-green-500",
+          icon: Shield,
+          text: "Low Threat",
+          description: "System is secure",
+        };
+    }
+  };
+
+  const config = getConfig(level);
+  const Icon = config.icon;
+
+  const sizeClasses = {
+    sm: { icon: "h-4 w-4", text: "text-sm", badge: "text-xs" },
+    md: { icon: "h-5 w-5", text: "text-base", badge: "text-sm" },
+    lg: { icon: "h-6 w-6", text: "text-lg", badge: "text-base" },
+  };
+
+  const classes = sizeClasses[size];
+
+  return (
+    <div className="flex items-center gap-2">
+      <div className={`p-2 rounded-full ${config.bgColor}`}>
+        <Icon className={`${classes.icon} text-white`} />
+      </div>
+
+      <div className="space-y-1">
+        <div className="flex items-center gap-2">
+          <Badge variant={config.color as "default" | "secondary" | "destructive" | "outline"} className={classes.badge}>
+            {config.text}
+          </Badge>
+          {score !== undefined && (
+            <span className={`font-medium ${classes.text}`}>{score}/100</span>
+          )}
+        </div>
+        <p className="text-xs text-muted-foreground">{config.description}</p>
+      </div>
+    </div>
+  );
+}