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

lib/trpc-client.ts

@@ -9,7 +9,7 @@ import { httpBatchLink } from "@trpc/client";
 import { createTRPCNext } from "@trpc/next";
 import superjson from "superjson";
 import type { AppRouter } from "@/server/routers/_app";
-import { CSRFClient } from "./csrf";
+import { CSRFClient } from "./csrf-client";
 
 function getBaseUrl() {
   if (typeof window !== "undefined") {