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- Fix outdated project information and missing developer workflows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/SecurityMetricsChart.tsx

@@ -0,0 +1,71 @@
+"use client";
+
+import {
+  Bar,
+  BarChart,
+  Line,
+  LineChart,
+  ResponsiveContainer,
+  Tooltip,
+  XAxis,
+  YAxis,
+} from "recharts";
+
+interface SecurityMetricsChartProps {
+  data: Array<{ hour: number; count: number }>;
+  type?: "line" | "bar";
+  title?: string;
+}
+
+export function SecurityMetricsChart({
+  data,
+  type = "line",
+  title,
+}: SecurityMetricsChartProps) {
+  const chartData = data.map((item) => ({
+    hour: `${item.hour}:00`,
+    count: item.count,
+  }));
+
+  const ChartComponent = type === "line" ? LineChart : BarChart;
+  const DataComponent =
+    type === "line" ? (
+      <Line
+        type="monotone"
+        dataKey="count"
+        stroke="#8884d8"
+        strokeWidth={2}
+        dot={{ fill: "#8884d8", strokeWidth: 2 }}
+      />
+    ) : (
+      <Bar dataKey="count" fill="#8884d8" />
+    );
+
+  return (
+    <div className="space-y-2">
+      {title && <h3 className="text-lg font-semibold">{title}</h3>}
+      <ResponsiveContainer width="100%" height={300}>
+        <ChartComponent data={chartData}>
+          <XAxis
+            dataKey="hour"
+            tick={{ fontSize: 12 }}
+            tickLine={{ stroke: "#e5e7eb" }}
+          />
+          <YAxis
+            tick={{ fontSize: 12 }}
+            tickLine={{ stroke: "#e5e7eb" }}
+            axisLine={{ stroke: "#e5e7eb" }}
+          />
+          <Tooltip
+            contentStyle={{
+              backgroundColor: "#f9fafb",
+              border: "1px solid #e5e7eb",
+              borderRadius: "6px",
+            }}
+          />
+          {DataComponent}
+        </ChartComponent>
+      </ResponsiveContainer>
+    </div>
+  );
+}