refactor: migrate customer and skill definition pages to use DashboardCrudPage component

- Replaced existing customer and skill definition page implementations with DashboardCrudPage for improved structure and functionality.
- Simplified state management and data fetching logic.
- Enhanced filtering and column definitions for better user experience.
- Updated translations to include new labels and processing messages.

web/messages/en-US.json

@@ -634,6 +634,7 @@
     "deleted": "Customer deleted: {name}",
     "deleteFailed": "Could not delete the customer.",
     "new": "New",
+    "refresh": "Refresh",
     "keywordPlaceholder": "Name, phone, email, company, or contact",
     "searchCompany": "Search companies",
     "query": "Search",
@@ -932,6 +933,7 @@
     "toggleStatus": "Toggle status for {name}",
     "edit": "Edit",
     "moreActions": "More actions for {name}",
+    "processing": "Working...",
     "stop": "Disable",
     "delete": "Delete",
     "loadingRows": "Loading AI agents...",
@@ -1500,6 +1502,7 @@
     "restoring": "Restoring...",
     "restore": "Restore",
     "deleting": "Deleting...",
+    "processing": "Working...",
     "delete": "Delete",
     "loadFailed": "Could not load skills.",
     "updated": "Skill updated: {name}",