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- Fix outdated project information and missing developer workflows

lib/nonce-context.tsx

@@ -0,0 +1,30 @@
+"use client";
+
+import { createContext, type ReactNode, useContext } from "react";
+
+interface NonceContextType {
+  nonce?: string;
+}
+
+const NonceContext = createContext<NonceContextType>({});
+
+export function NonceProvider({
+  children,
+  nonce,
+}: {
+  children: ReactNode;
+  nonce?: string;
+}) {
+  return (
+    <NonceContext.Provider value={{ nonce }}>{children}</NonceContext.Provider>
+  );
+}
+
+export function useNonce() {
+  const context = useContext(NonceContext);
+  return context.nonce;
+}
+
+export function useCSPNonce() {
+  return useNonce();
+}