fix: treat @openedx/frontend-build as an optional peerDep to avoid direct dep in consuming MFEs (#790)

Author: adamstankiewicz

package-lock.json

@@ -83,5 +83,11 @@
     "react-redux": "^7.1.1 || ^8.1.1",
     "react-router-dom": "^6.0.0",
     "redux": "^4.0.4"
+  },
+  "peerDependenciesMeta": {
+    "@openedx/frontend-build": {
+      "optional": true,
+      "reason": "This package is only a peer dependency to ensure using a minimum compatible version that provides env.config and PARAGON_THEME support. It is not needed at runtime, and may be omitted with `--omit=optional`."
+    }
   }
 }