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Adds an optional per-printer integration with KXGauge (https://gitea.it-drui.de/viewit/kxgauge), a small ESP32 round-face display that shows printer status as an emotion and hotend temperature as a color ring. KXGauge only exposes a GET-only HTTP API with no push/websocket, so the bridge actively pushes to it from the existing MQTT callbacks (_on_temp for the heat ring, _on_print + offline transitions for the emotion) whenever state actually changes, with a built-in dedupe so it doesn't spam the device every poll tick. - kxgauge_client.py: thin synchronous HTTP client (mirrors spoolman_client.py's shape - called from the MQTT reader thread). - New [kxgauge]/[kxgauge_mapping] config.ini sections; the mapping (kobra_state -> KXGauge emotion) is user-editable with a sane default and falls back per-key if only partially configured. - Settings UI: new card under Integrations with enable/URL/target-temp fields, a per-state emotion mapping list, and a connection-test button (/api/kxgauge/test). - Multi-printer aware: kxgauge_url/enabled/heat_peak merge per [printer_N] like the existing power-switch settings. Also fixes a real bug found while testing this: _find_config_path() resolves to the live project config/config.ini, not a sandboxed path, so any test hitting /api/settings POST without stubbing it out will silently overwrite the real printer config. test_settings.py already guards against this - test_kxgauge.py now does too.