feat(agents, config, dashboard, i18n): add agent line provision wizard, site deletion, and site dashboard with multi-language support

Added agent line provision wizard page with permission gating, replacing redirect placeholder. Introduced site deletion API and UI with confirmation dialog in integration sites management. Added new site-scoped dashboard panel showing bet metrics, P/L trends, active players, and quick links. Enhanced chart tooltip to support custom formatters and fix indicator color

src/i18n/locales/en/config.json

@@ -72,6 +72,13 @@
     "rotateConfirmTitle": "Rotate secrets?",
     "rotateConfirmDescription": "New SSO and wallet keys will be generated for {{code}}. Old keys stop working immediately.",
     "rotateConfirm": "Rotate",
+    "delete": "Delete site",
+    "deleteSuccess": "Deleted site {{code}}",
+    "deleteFailed": "Failed to delete site",
+    "deleteConfirmTitle": "Delete this site?",
+    "deleteConfirmDescription": "This permanently removes site {{code}} ({{name}}), its agent line, settlement periods, players, and site admin accounts. This cannot be undone.",
+    "deleteConfirm": "Delete",
+    "deleting": "Deleting…",
     "secretsTitle": "Save these secrets now",
     "secretsDescription": "Secrets for {{code}} are shown only once.",
     "secretsDismiss": "I have saved them",