feat: bearer auth, auto-sync events, test seed

- Add bearer plugin to BetterAuth for mobile auth
- Auto-sync birthday/anniversary events on client create/update
- Add /api/events/sync-all endpoint for bulk sync
- Add test user seed (test@test.com / test)
- Expose set-auth-token header in CORS

package.json

@@ -12,7 +12,8 @@
     "db:generate": "drizzle-kit generate",
     "db:migrate": "drizzle-kit migrate",
     "db:push": "drizzle-kit push",
-    "db:studio": "drizzle-kit studio"
+    "db:studio": "drizzle-kit studio",
+    "db:seed": "bun run src/db/seed.ts"
   },
   "devDependencies": {
     "@types/bun": "latest",