runtime: harden query lifecycle state handling

[argahsuknesib]

Summary

• increment query execution counts on successful start
• persist lifecycle status in registry metadata so HTTP query details reflect stop and restart transitions
• track all MQTT subscriber worker handles and join workers during stop
• add lifecycle-focused API and HTTP integration coverage

Verification

• cargo test --test janus_api_integration_test --all-features
• cargo test --test http_server_integration_test --all-features
• cargo test --all-features
• cargo clippy --all-targets --all-features -- -D warnings