feat: add security audit seed data with real findings from code review

- Added seed-security.ts with comprehensive audit data for all 5 projects
- Real findings from actual code inspection: auth, CORS, rate limiting,
  error handling, dependencies, TLS certs, infrastructure
- 35 audit entries across Hammer Dashboard, Network App, Todo App, nKode,
  and Infrastructure
- Fixed unused deleteAudit import warning in SecurityPage

frontend/src/pages/SecurityPage.tsx

@@ -80,14 +80,14 @@ async function updateAudit(
   return res.json();
 }
 
-// @ts-expect-error unused but kept for future use
-async function deleteAudit(id: string): Promise<void> {
+async function _deleteAudit(id: string): Promise<void> {
   const res = await fetch(`${BASE}/${id}`, {
     method: "DELETE",
     credentials: "include",
   });
   if (!res.ok) throw new Error("Failed to delete audit");
 }
+export { _deleteAudit as deleteAudit };
 
 // ─── Helpers ───