feat: implement cache layer, CSP improvements, and database performance optimizations

- Add Redis cache implementation with LRU eviction
- Enhance Content Security Policy with nonce generation
- Optimize database queries with connection pooling
- Add cache invalidation API endpoints
- Improve security monitoring performance

components/providers/CSRFProvider.tsx

@@ -15,7 +15,7 @@ import {
   useEffect,
   useState,
 } from "react";
-import { CSRFClient } from "../../lib/csrf";
+import { CSRFClient } from "../../lib/csrf-client";
 
 interface CSRFContextType {
   token: string | null;