fix: add pricing.js and pricing.json to package files

cache.js requires ./pricing but these files were missing from the
files array in package.json, causing npx agentlytics to crash with
MODULE_NOT_FOUND.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ozers

package.json

@@ -9,6 +9,8 @@
   "files": [
     "index.js",
     "cache.js",
+    "pricing.js",
+    "pricing.json",
     "server.js",
     "share-image.js",
     "relay-server.js",