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

backend/package.json

@@ -9,7 +9,8 @@
     "db:push": "drizzle-kit push",
     "db:studio": "drizzle-kit studio",
     "test": "bun test",
-    "test:ci": "bun test --bail"
+    "test:ci": "bun test --bail",
+    "seed:security": "bun run src/seed-security.ts"
   },
   "dependencies": {
     "@elysiajs/cors": "^1.2.0",