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- Fix outdated project information and missing developer workflows

app/api/dashboard/users/route.ts

@@ -11,7 +11,7 @@ interface UserBasicInfo {
   role: string;
 }
 
-export async function GET(_request: NextRequest) {
+export async function GET() {
   const session = await getServerSession(authOptions);
   if (!session?.user || session.user.role !== "ADMIN") {
     return NextResponse.json({ error: "Forbidden" }, { status: 403 });