fix(ci): add _redirects for netlify and clean up interop test

- Create `_redirects` file with catch-all rule (`/* /index.html 200`) to fix Netlify "Redirect rules" check failure and support SPA routing.
- Remove unused `NOTE_TYPES` import from `scripts/agent/interop-test.mjs`.

Co-authored-by: PR0M3TH3AN <[email protected]>

_redirects

@@ -0,0 +1 @@
+/* /index.html 200

scripts/agent/interop-test.mjs

@@ -9,8 +9,7 @@ import { startRelay } from './load-test-relay.mjs';
 import {
     buildVideoPostEvent,
     buildViewEvent,
-    buildLegacyDirectMessageEvent,
-    NOTE_TYPES
+    buildLegacyDirectMessageEvent
 } from '../../js/nostrEventSchemas.js';
 import { decryptDM } from '../../js/dmDecryptor.js';
 import { generateSecretKey, getPublicKey } from 'nostr-tools';