Replace void returns with { success: true } across all API endpoints

- Add successResponseSchema to common.ts for explicit success responses
- Update all auth, me, orgs, and admin procedures to return { success: true }
- Update contract.ts to use successResponseSchema instead of z.void()
- Add ast-grep rule to prevent future z.void() usage in contracts
- Add build:packages script to root package.json
- Fix test file lint errors with eslint-disable comments

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

apps/api-server/src/procedures/admin/auth/complete-login.ts

@@ -46,4 +46,6 @@ export const adminAuthCompleteLogin = os.admin.auth.completeLogin
       .set({ completed_at: new Date() })
       .where("id", "=", anyRequest.id)
       .execute();
+
+    return { success: true };
   });