feat: HA light output targets — cast LED colors to Home Assistant lights

New output target type `ha_light` that sends averaged LED colors to HA
light entities via WebSocket service calls (light.turn_on/turn_off):

Backend:
- HARuntime.call_service(): fire-and-forget WS service calls
- HALightOutputTarget: data model with light mappings, update rate, transition
- HALightTargetProcessor: processing loop with delta detection, rate limiting
- ProcessorManager.add_ha_light_target(): registration
- API schemas/routes updated for ha_light target type

Frontend:
- HA Light Targets section in Targets tab tree nav
- Modal editor: HA source picker, CSS source picker, light entity mappings
- Target cards with start/stop/clone/edit actions
- i18n keys for all new UI strings

server/src/wled_controller/static/js/app.ts

@@ -51,7 +51,7 @@ import {
 import { startEventsWS, stopEventsWS } from './core/events-ws.ts';
 import { startEntityEventListeners } from './core/entity-events.ts';
 import {
-    startPerfPolling, stopPerfPolling,
+    startPerfPolling, stopPerfPolling, setPerfMode,
 } from './features/perf-charts.ts';
 import {
     loadPictureSources, switchStreamTab,
@@ -290,6 +290,7 @@ Object.assign(window, {
     stopUptimeTimer,
     startPerfPolling,
     stopPerfPolling,
+    setPerfMode,
 
     // streams / capture templates / PP templates
     loadPictureSources,