fix(dev): bind frontend to 127.0.0.1:8080 and avoid EACCES\nfix(backend): bind server to 127.0.0.1:8081, add permissive CORS whitelist\nfix(auth): login form UX remove default username, clarify placeholder, add test account autofill\nchore(api): set frontend API_BASE_URL to 127.0.0.1:8081\nrefactor(assignments): lifecycle/state logic and archive endpoint\nfeat(analytics): add exam stats endpoint and client method\nchore(lint): add eslint configs

.eslintignore

@@ -0,0 +1,5 @@
+node_modules
+.next
+dist
+backend/dist
+backend/node_modules