feat(journal): surface Fedify logs via LogTape console sink

Inbound Mastodon Follows are being rejected 401 (signature
verification) on staging and Fedify's diagnostics were invisible:
it logs through LogTape, which is silent until configured.

- Configure LogTape with a console sink for the 'fedify' category when
  the federation instance is built; level via FEDERATION_LOG_LEVEL
  (default info).
- Staging deploy sets FEDERATION_LOG_LEVEL=debug for the soak —
  signature-verification detail per request; dial down once proven.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/journal/package.json

@@ -14,6 +14,7 @@
   "dependencies": {
     "@fedify/fedify": "2.1.16",
     "@js-temporal/polyfill": "^0.5.1",
+    "@logtape/logtape": "^2.0.5",
     "@react-router/node": "catalog:",
     "@react-router/serve": "catalog:",
     "@sentry/node": "catalog:",