Fix Garmin token connection not persisting after save

Root cause: The setup-db script was missing user field definitions
(garminConnected, tokens, etc.). Production PocketBase had no such
fields, so updates silently failed to persist.

Changes:
- Add user custom fields to setup-db.ts (matches e2e harness)
- Fix status route to use strict boolean check (=== true)
- Add verification in tokens route with helpful error message
- Add ENCRYPTION_KEY to playwright config for e2e tests
- Add comprehensive e2e tests for Garmin connection flow

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

playwright.config.ts

@@ -54,6 +54,8 @@ export default defineConfig({
       // Use the test PocketBase instance (port 8091)
       NEXT_PUBLIC_POCKETBASE_URL: "http://127.0.0.1:8091",
       POCKETBASE_URL: "http://127.0.0.1:8091",
+      // Required for Garmin token encryption
+      ENCRYPTION_KEY: "e2e-test-encryption-key-32chars",
     },
   },
 });