feat: finish the host-metrics plugin, move host status into core (B16)

src/backend/tests/database/repositories/host-credential-repositories.test.ts

@@ -483,7 +483,6 @@ describe("HostRepository and CredentialRepository", () => {
       port: 22,
       username: "root",
       authType: "password",
-      statsConfig: JSON.stringify({ cpu: true }),
     });
     const second = await repo.hosts.create({
       userId: "user-1",