Add EcoVacs dashboard as YAML-mode

Convert storage-mode dashboard to dashboards/ecovacs.yaml. Preserves
all button-card templates, room queue buttons, conditional controls,
vacuum map, and settings panel exactly as configured in the UI.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

configuration.yaml

@@ -15,6 +15,13 @@ lovelace:
       icon: mdi:thermometer
       show_in_sidebar: true
       require_admin: false
+    lovelace-ecovacs:
+      mode: yaml
+      filename: dashboards/ecovacs.yaml
+      title: EcoVacs
+      icon: mdi:robot-vacuum
+      show_in_sidebar: true
+      require_admin: false
 
 automation: !include automations.yaml
 script: !include scripts.yaml