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- Fix outdated project information and missing developer workflows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

@@ -99,6 +99,24 @@ const SessionsIcon = () => (
   </svg>
 );
 
+const AuditLogIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    className="h-5 w-5"
+    fill="none"
+    viewBox="0 0 24 24"
+    stroke="currentColor"
+  >
+    <title>Audit Logs</title>
+    <path
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      strokeWidth={2}
+      d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"
+    />
+  </svg>
+);
+
 const LogoutIcon = () => (
   <svg
     xmlns="http://www.w3.org/2000/svg"
@@ -352,6 +370,14 @@ export default function Sidebar({
             isActive={pathname === "/dashboard/users"}
             onNavigate={onNavigate}
           />
+          <NavItem
+            href="/dashboard/audit-logs"
+            label="Audit Logs"
+            icon={<AuditLogIcon />}
+            isExpanded={isExpanded}
+            isActive={pathname === "/dashboard/audit-logs"}
+            onNavigate={onNavigate}
+          />
         </nav>
         <div className="p-4 border-t mt-auto space-y-2">
           {/* Theme Toggle */}