chore: remove dead broker mode code and @agent-relay/storage dependency

The integrated broker server (server.ts) is completely unused — all entry
points route through proxy-server.ts. This removes server.ts and all 23
files exclusively used by it (~7,700 lines), plus the @agent-relay/storage,
@agent-relay/protocol, and @agent-relay/utils dependencies.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: khaliqgant

package-lock.json

@@ -34,13 +34,10 @@
   },
   "dependencies": {
     "@agent-relay/config": "^3.2.5",
-    "@agent-relay/protocol": "^2.3.14",
     "@agent-relay/sdk": "^3.2.5",
-    "@agent-relay/storage": "^2.3.14",
     "@agent-relay/trajectory": "^3.2.5",
-    "@agent-relay/utils": "^3.2.5",
-    "@relaycast/sdk": "^0.5.1",
-    "@relaycast/types": "^0.5.1",
+    "@relaycast/sdk": "0.5.2",
+    "@relaycast/types": "0.5.2",
     "express": "^5.2.1",
     "http-proxy-middleware": "^3.0.0",
     "ws": "^8.18.3"